The Diablo Rebar Demon 7/8" x 24" x 29" SDS-Max 4-Cutter Full Carbide Head Hammer Drill Bit is engineered for professionals who demand maximum durability, speed, and precision when drilling through reinforced concrete and rebar-laden structures. Designed for use with SDS-Max rotary hammer drills, this heavy-duty bit combines Diablo's Dura-Carbide technology with a full carbide head and Tri-Metal Fusion Welding to deliver performance that outlasts standard 2-cutter hammer drill bits by up to 7 times - making it the go-to choice for anchor setting, structural drilling, and demanding concrete applications where ordinary bits fall short.

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 the total cost per hole drilled.
• Dura-Carbide with up to 2X more carbide - withstands up to 1800 deg. Fahrenheit of intense heat generated by rebar hits, while standard bits fail at 800 deg. Fahrenheit, keeping performance consistent in the most punishing conditions.
• Impact Resistant 4-Cutter Full Carbide Head - extracts smaller bites of rebar for controlled, consistent carbide wear and reduced vibration, delivering fast and precise holes even through heavily reinforced concrete.
• Tri-Metal Fusion Welding with up to 3X stronger weld - keeps the full carbide head intact during extreme impact situations such as unexpected rebar strikes, preventing catastrophic head separation and maintaining safe, reliable operation.
• Precision Tip geometry - delivers the stability and accuracy required for fast, precise holes in reinforced concrete, which is critical for proper anchor setting and structural fastening.
• Optimized flute design removes dust faster - keeping the carbide head cooler for ultimate strength and durability, reducing heat buildup that degrades bit performance and shortens service life.
• Wear mark indicator - ensures precise hole depth making so installers can achieve consistent, code-compliant anchor embedment depths without guesswork.
• Optimized for maximum performance in corded and cordless SDS-Max rotary hammers - giving contractors flexibility to use the bit with the power source best suited to their job site conditions.

Why This Product

• When drilling through reinforced concrete where rebar strikes are unavoidable, the 4-cutter full carbide head and Tri-Metal Fusion Welding work together to absorb impact and maintain bit integrity - rather than shattering or deforming like conventional bits that lack this construction.
• The Dura-Carbide formulation tolerates heat up to 1800 deg. Fahrenheit, more than double the 800 deg. Fahrenheit threshold where standard bits fail, meaning performance does not degrade even during sustained high-speed drilling in dense concrete or masonry.
• With a 29" overall length and a 24" working length, this bit reaches deep embedment depths required for structural anchoring in thick concrete walls, slabs, or columns without requiring an extension.
• Produced in Germany and featuring an optimized flute design that clears debris rapidly, this bit is built to sustain productivity throughout long drilling sessions in brick, block, concrete, and rebar-reinforced applications.

Specifications

• Brand: Diablo
• Model Number: DMAMX1190
• Category: SDS-Max 4-Cutter
• Diameter: 7/8"
• Length: 29"
• Working Length: 24"
• Shank: SDS Max
• Head Type: Full Carbide Head
• Number of Cutters: 4
• Compatible Tools: SDS-Max Rotary Hammer Drill
• Compatible Materials: Reinforced Concrete; Concrete; Rebar; Brick/Block
• Pack Quantity: 1
• Country of Origin: Germany

Approved Applications

• Reinforced concrete and concrete drilling for anchor setting, structural fastening, and penetration work

Frequently Asked Questions

What makes the Rebar Demon bit more heat-resistant than standard hammer drill bits?

Diablo's Dura-Carbide formula uses up to 2X more carbide than standard bits, allowing it to withstand up to 1800 deg. Fahrenheit of heat generated during drilling through rebar. Standard hammer drill bits fail at 800 deg. Fahrenheit, meaning they degrade rapidly during rebar contact while the Rebar Demon maintains cutting performance throughout the hole.

Why does a 4-cutter head outperform a standard 2-cutter head in reinforced concrete?

The 4-cutter full carbide head takes smaller, more controlled bites of rebar during drilling. This controlled carbide wear reduces vibration, minimizes stress on the head, and distributes impact more evenly - resulting in up to 7X longer service life compared to standard 2-cutter hammer drill bits.

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

Yes. This Diablo Rebar Demon bit is optimized for maximum performance in both corded and cordless SDS-Max rotary hammer drills, giving professionals the flexibility to match the bit to their preferred power source on any job site.

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

The overall length of this bit is 29", which includes the SDS-Max shank. The working length - the portion of the bit that actively drills - is 24". This 24" working length allows for deep embedment holes required for structural anchor setting in thick concrete elements without the need for a separate extension.