The Diablo Rebar Demon 5/8 in. x 16 in. x 18 in. SDS-Plus 4-Cutter Full Carbide Head Hammer Drill Bit is an engineered solution for professionals drilling through reinforced concrete, standard concrete, brick, and block where rebar strikes are unavoidable. Diablo developed this bit around Dura-Carbide technology and a 4-cutter full carbide head design that outlasts standard 2-cutter bits by up to 7X, making it the go-to choice for anchor setting, structural drilling, and high-volume concrete work with both corded and cordless SDS-Plus rotary hammers.

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, lowering total cost per hole drilled.
• Dura-Carbide with up to 2X more carbide - withstands up to 1,800 deg. Fahrenheit of intense heat compared to standard bits that fail at 800 deg. Fahrenheit, keeping the bit cutting even during aggressive rebar contact.
• Impact Resistant 4-Cutter Full Carbide Head - extracts smaller bites of rebar for controlled, consistent carbide wear and reduced vibration, delivering fast, precise holes in reinforced concrete without premature bit failure.
• Tri-Metal Fusion Welding with up to 3X stronger weld - keeps the full carbide head intact during extreme impact such as rebar strikes, preventing head separation and maintaining drilling accuracy under heavy hammer drill stress.
• Precision Tip - delivers the stability and accuracy required for fast, precise holes, which is critical when setting anchors in reinforced concrete where positioning tolerance is tight.
• Optimized flute design - removes dust faster and keeps the carbide head cooler for ultimate strength and durability, reducing heat buildup that shortens bit life during extended drilling sessions.
• Wear mark indicator - ensures precise hole depth control so anchors are set to the correct embedment depth the first time, without the need for separate depth stops.
• Optimized for corded and cordless SDS-Plus rotary hammers - delivers maximum performance across a wide range of tool platforms, giving contractors flexibility on the job site without sacrificing speed or durability.

Why This Product

• Drilling through reinforced concrete means unavoidable rebar hits - the 4-cutter full carbide head and Tri-Metal Fusion Welding are purpose-built to absorb those impacts without shattering or losing the head, where a standard 2-cutter bit would break or wear rapidly.
• Heat is the primary cause of carbide failure in concrete drilling - Dura-Carbide's tolerance up to 1,800 deg. Fahrenheit (more than double the 800 deg. Fahrenheit threshold of standard bits) means this bit keeps cutting in conditions that destroy conventional hammer drill bits.
• The optimized flute design actively evacuates concrete dust to keep the cutting head cooler, which directly extends working life and maintains hole quality - particularly valuable during high-volume anchor setting in concrete structures.
• With a 16 in. working length on an 18 in. overall bit, this size is suited for deep anchor holes in thick concrete slabs and walls where shorter bits cannot reach adequate embedment depth.

Specifications

• Brand: Diablo
• Sub-Brand: Rebar Demon
• Model Number: DMAPL4240
• Category: SDS-Plus 4-Cutter
• Diameter: 5/8 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: Germany

Approved Applications

• Reinforced concrete and concrete

Frequently Asked Questions

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

The Rebar Demon uses a 4-cutter full carbide head made with Dura-Carbide, which provides up to 2X more carbide material compared to standard bits. This design takes smaller bites of rebar for controlled, consistent carbide wear and reduced vibration, delivering up to 7X longer life than standard 2-cutter hammer drill bits. Standard bits typically fail at around 800 deg. Fahrenheit, while the Rebar Demon withstands up to 1,800 deg. Fahrenheit of intense heat.

What is the difference between the overall length and the working length of this bit?

This bit has an overall length of 18 in. and a working length - the portion of the bit that actively cuts into the material - of 16 in. The remaining 2 in. is the SDS-Plus shank that seats into the rotary hammer. The 16 in. working length makes this bit well suited for drilling deep anchor holes in thick concrete slabs and walls.

What tools are compatible with this hammer drill bit?

This bit is designed for use with SDS-Plus rotary hammer drills and is optimized for maximum performance in both corded and cordless SDS-Plus rotary hammers. It is not intended for standard drill drivers or impact drivers - a dedicated SDS-Plus rotary hammer is required to properly engage the SDS-Plus shank and deliver the hammer action needed for concrete drilling.

Can this bit drill through concrete that contains rebar?

Yes - drilling through reinforced concrete containing rebar is the primary design purpose of the Rebar Demon. The impact resistant 4-cutter full carbide head is built to withstand rebar strikes by taking controlled, small bites rather than absorbing the full force of a direct impact. Tri-Metal Fusion Welding keeps the carbide head intact during these extreme impact situations, and the Precision Tip helps maintain accuracy even after rebar contact.