The Diablo Rebar Demon 3/8 in. x 16 in. x 18 in. SDS-Plus 4-Cutter Full Carbide Head Hammer Drill Bit is engineered for professionals who need a faster, longer-lasting solution for drilling through reinforced concrete, standard concrete, brick, and block. Built in the United States, this heavy-duty hammer drill bit combines Diablo's proprietary Dura-Carbide technology with an impact-resistant 4-cutter full-carbide head, making it a go-to tool for anchor setting and structural drilling where rebar contact is unavoidable. Whether you are using a corded or cordless SDS-Plus rotary hammer, this Rebar Demon bit delivers the precision and durability demanded by high-stakes concrete applications.

Key Features

• Up to 7X longer life versus standard 2-cutter hammer drill bits - fewer bit replacements on the job means lower cost and less downtime over the course of a project.
• Dura-Carbide head with up to 2X more carbide withstands up to 1800 deg. Fahrenheit of intense heat versus standard bits that fail at 800 deg. Fahrenheit - keeps the bit cutting efficiently even when rebar contact generates extreme temperatures.
• Impact Resistant 4-Cutter Full Carbide Head extracts smaller bites of rebar for controlled, consistent carbide wear and reduced vibration - delivers fast, precise holes without sacrificing bit integrity or user comfort.
• Tri-Metal Fusion Welding features up to 3X stronger weld to keep the full carbide head intact during extreme impact such as rebar - prevents catastrophic head separation in the most demanding reinforced concrete environments.
• Precision Tip delivers stability and accuracy required for fast, precise holes - ensures the bit stays on target from the first strike, which is critical for anchor setting in reinforced slabs and walls.
• Optimized flute design removes dust faster, keeping the carbide head cooler for ultimate strength and durability - faster debris evacuation means the bit runs cooler and lasts longer between uses.
• Wear mark indicator ensures precise hole making - gives the operator a reliable visual reference for accurate depth control without the need for a separate depth stop.
• Optimized for maximum performance in corded and cordless SDS-Plus or SDS-Max rotary hammers - one bit works across a wide range of professional-grade hammer drill platforms.

Why This Product

• Reinforced concrete is one of the toughest drilling environments because unexpected rebar contact can destroy standard bits instantly. The Rebar Demon is specifically engineered to survive and continue cutting through rebar rather than failing on contact, making it the logical choice for any drilling task where rebar presence is likely or confirmed.
• The combination of 1800 deg. Fahrenheit heat resistance and Tri-Metal Fusion Welding means the full carbide head stays bonded and functional even during prolonged high-impact drilling sessions - reducing the risk of mid-job bit failure that can delay anchor setting or structural work.
• With up to 7X longer service life compared to standard 2-cutter bits, this 3/8 in. x 18 in. bit represents a significantly lower cost-per-hole over its working lifetime, making it a practical upgrade for contractors drilling large volumes of holes in concrete structures.
• The optimized flute design and Precision Tip work together to produce fast, accurate holes in reinforced concrete - critical when placing anchors or fasteners that require tight dimensional tolerances for load-bearing applications.

Specifications

• Brand: Diablo
• Model Number: DMAPL4170
• Sub-Brand: Rebar Demon
• Category: SDS-Plus 4-Cutter
• Diameter: 3/8 in.
• Length: 18 in.
• Working Length: 16 in.
• Shank: SDS-Plus
• Head Type: Full Carbide Head
• Number of Cutters: 4
• Compatible Tools: SDS-Plus Rotary Hammer Drill
• Compatible Materials: Reinforced Concrete; Concrete; Rebar; Brick/Block
• Pack Quantity: 1
• Country of Origin: United States

Approved Applications

• Reinforced concrete and concrete drilling, including anchor setting in rebar-bearing slabs, walls, and structural members

Frequently Asked Questions

What makes the Rebar Demon different from a standard SDS-Plus hammer drill bit?

Standard hammer drill bits typically use a 2-cutter head and carbide that begins to fail at around 800 deg. Fahrenheit. The Diablo Rebar Demon uses a 4-cutter full carbide head made with Dura-Carbide technology that features up to 2X more carbide and withstands up to 1800 deg. Fahrenheit. It also incorporates Tri-Metal Fusion Welding for up to 3X stronger head attachment, and an optimized flute design for faster dust removal - all combining to deliver up to 7X longer life versus standard 2-cutter bits.

What is the working length and total length of this bit, and how do they differ?

This bit has a total length of 18 in. and a working length of 16 in. The working length refers to the portion of the bit - from the tip to the start of the shank - that is actively engaged in drilling. The 2 in. difference is the SDS-Plus shank that is retained inside the rotary hammer chuck during operation.

Is this bit compatible with cordless rotary hammer drills?

Yes. The Rebar Demon SDS-Plus 4-Cutter bit is optimized for maximum performance in both corded and cordless SDS-Plus rotary hammers. It uses a standard SDS-Plus shank, which fits the quick-change chuck system found on a wide range of professional rotary hammer platforms.

What does the wear mark indicator do, and why is it useful on a job site?

The wear mark indicator is a visual reference built into the bit that allows the operator to monitor hole depth during drilling and confirm when the bit has reached the required depth. This is particularly valuable when setting anchors in reinforced concrete, where precise hole depth is necessary for proper fastener seating and load-rated performance.