The Diablo 1" x 16" x 21" Rebar Demon SDS-Max 4-Cutter Full Carbide Head Hammer Drill Bit is engineered for professionals who demand maximum durability and speed when drilling through reinforced concrete, standard concrete, brick, block, and rebar. Designed by Diablo to outperform conventional 2-cutter bits in every measurable way, this heavy-duty SDS-Max hammer drill bit delivers fast, precise holes in the most demanding anchor-setting applications - making it a go-to choice for concrete drilling in both new construction and renovation work.

Key Features

• Up to 7X longer life versus standard 2-cutter hammer drill bits - dramatically reduces bit replacement frequency and downtime on the job site
• Diablo Dura-Carbide head features up to 2X more carbide that withstands up to 1800 deg. Fahrenheit of intense heat - keeps drilling performance strong even during rebar contact where standard bits fail at just 800 deg. Fahrenheit
• Impact Resistant 4-Cutter Full Carbide Head extracts smaller bites of rebar for controlled, consistent carbide wear and reduced vibration - delivers fast, precise holes with less operator fatigue
• Tri-Metal Fusion Welding features up to 3X stronger weld to keep the full carbide head intact during extreme impact such as rebar - prevents costly head breakage in high-stress drilling situations
• Precision Tip delivers stability and accuracy required for fast, precise holes - ensures cleaner entry points for anchor setting in reinforced concrete
• Optimized flute design removes dust faster, keeping the carbide head cooler for ultimate strength and durability - extends bit life by reducing heat buildup in deep drilling applications
• Wear mark indicator ensures precise hole making - gives the user a clear visual reference to achieve consistent hole depths without guessing
• Optimized for maximum performance in corded and cordless SDS-Max rotary hammers - provides full compatibility across a wide range of professional hammer drill tools

Why This Product

• Reinforced concrete drilling demands a bit that can survive rebar contact repeatedly - the 4-cutter full carbide head and Tri-Metal Fusion Welding are specifically designed to handle rebar impact without catastrophic failure, making this bit the right solution for rebar-dense slabs and structural concrete work
• Heat is the primary cause of carbide failure in hammer drill bits - Dura-Carbide's ability to endure up to 1800 deg. Fahrenheit, more than double the 800 deg. Fahrenheit threshold of standard bits, means fewer interruptions and fewer replacements during extended drilling sessions
• A 21" overall length with a 16" working length gives this bit the reach needed for deep anchor holes in thick concrete walls, floors, and foundations where shorter bits simply cannot reach
• With a 1" diameter and SDS-Max shank, this bit is sized for large-diameter anchor applications in high-load structural installations - matching the torque output and power delivery of professional-grade SDS-Max rotary hammers

Specifications

• Brand: Diablo
• Model Number: DMAMX1220
• Category: SDS-Max 4-Cutter
• Diameter: 1"
• Length: 21"
• Working Length: 16"
• Shank: SDS-Max
• Head Type: Full Carbide Head
• Number of Cutters: 4
• Compatible Tools: SDS-Max Rotary Hammer Drill
• Materials: Reinforced Concrete; Concrete; Rebar; Brick/Block
• Pack Quantity: 1
• Country of Origin: Germany

Approved Applications

• Reinforced concrete and concrete drilling for anchor setting and structural fastening applications

Frequently Asked Questions

What makes the Rebar Demon different from a standard 2-cutter hammer drill bit?

The Rebar Demon features a 4-cutter full carbide head rather than a standard 2-cutter design. This configuration takes smaller bites of rebar, producing controlled and consistent carbide wear, reduced vibration, and up to 7X longer bit life. The full carbide head is secured with Tri-Metal Fusion Welding that provides up to 3X stronger weld strength, keeping the head intact even under extreme rebar impact conditions.

What is Dura-Carbide and why does it matter for rebar drilling?

Dura-Carbide is Diablo's proprietary carbide formulation that features up to 2X more carbide material compared to standard bits. This increased carbide content allows the bit to withstand up to 1800 deg. Fahrenheit of intense heat generated during rebar contact - a temperature threshold that far exceeds the 800 deg. Fahrenheit limit where standard bits typically fail. This means the bit maintains its cutting ability and structural integrity even in the most heat-intensive drilling scenarios.

Is this bit compatible with cordless SDS-Max rotary hammers?

Yes. This Rebar Demon bit is optimized for maximum performance in both corded and cordless SDS-Max rotary hammer drills, giving professionals flexibility to use it with the power source that best suits their job site setup.

What is the purpose of the wear mark indicator on this bit?

The wear mark indicator is a visual reference built into the bit that helps ensure precise hole making. It allows the user to monitor drilling depth and carbide wear consistently, which is especially important when setting anchors that require accurate hole depths in reinforced concrete or concrete substrates.