The Diablo Rebar Demon 7/8 in. x 47 in. x 52 in. 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, and brick or block. Diablo's Rebar Demon series represents a breakthrough in hammer drill bit technology, combining a full carbide head, Tri-Metal Fusion Welding, and an optimized flute design to keep bits cooler, last longer, and deliver faster, more precise holes than conventional 2-cutter bits - even in the most punishing conditions involving rebar impact.

Key Features

• Up to 7X longer life versus standard 2-cutter hammer drill bits - dramatically reduces bit replacement frequency and downtime on jobsites where reinforced concrete drilling is routine.
• Diablo Dura-Carbide with up to 2X more carbide material - withstands up to 1800 deg. Fahrenheit of intense heat from friction and rebar impact, compared to standard bits that fail at 800 deg. Fahrenheit, so the bit stays functional under conditions that destroy ordinary tooling.
• 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 in rebar-heavy concrete applications.
• Tri-Metal Fusion Welding with up to 3X stronger weld - keeps the full carbide head firmly intact during extreme impact events such as direct rebar strikes, preventing catastrophic bit failure and protecting the operator.
• Precision Tip design - delivers the stability and accuracy required for fast, precise holes in reinforced concrete, making it ideal for anchor setting applications where hole placement is critical.
• Optimized flute design removes dust faster - keeps the carbide head cooler during drilling for ultimate strength and long-term durability across extended use.
• Wear mark indicator - ensures precise hole depth control for consistent, accurate hole making without guesswork.
• Optimized for corded and cordless SDS-Max rotary hammers - delivers maximum performance across a wide range of professional hammer drill equipment.

Why This Product

• For contractors drilling into reinforced concrete, the 4-cutter full carbide head is built specifically to withstand rebar contact - standard 2-cutter bits are not designed for this and fail far more quickly, making this bit a purpose-built solution for real-world field conditions.
• The ability to tolerate heat up to 1800 deg. Fahrenheit - more than double the 800 deg. Fahrenheit threshold where standard bits break down - means this bit maintains its cutting performance in sustained, high-speed drilling sessions without premature failure.
• With a working length of 47 in. and an overall length of 52 in., this bit reaches deep into thick concrete structures, making it well suited for long-reach anchor setting in walls, floors, and structural elements where shorter bits simply cannot reach.
• Made in Germany and produced with Tri-Metal Fusion Welding, this bit is built to a standard of quality that justifies its use on demanding commercial and industrial concrete drilling tasks where bit reliability directly affects project timelines.

Specifications

• Brand: Diablo
• Model Number: DMAMX1205
• Category: SDS-Max 4-Cutter
• Diameter: 7/8 in.
• Length: 52 in.
• Working Length: 47 in.
• Shank: SDS-Max
• Head Type: Full Carbide Head
• Number of Cutters: 4
• Materials: Concrete; Concrete with Rebar; Brick/Block
• Pack Quantity: 1
• Country of Origin: Germany

Approved Applications

• Reinforced concrete and concrete drilling
• Anchor setting in reinforced concrete
• Drilling through concrete with rebar
• Brick and block drilling

Frequently Asked Questions

What makes the Rebar Demon bit different from a standard hammer drill bit when it hits rebar?

Standard 2-cutter hammer drill bits are not designed to handle direct rebar impact and typically fail at heat levels around 800 deg. Fahrenheit. The Rebar Demon's 4-cutter full carbide head takes smaller bites of rebar, distributing the impact load more evenly for controlled, consistent carbide wear and reduced vibration. Combined with Dura-Carbide material rated to withstand up to 1800 deg. Fahrenheit, the bit continues to perform under conditions that destroy conventional tooling.

Is this bit compatible with cordless rotary hammers?

Yes. The Rebar Demon SDS-Max bit is optimized for maximum performance in both corded and cordless SDS-Max rotary hammers, giving contractors flexibility across their tool inventory without sacrificing drilling speed or bit longevity.

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

The overall length of this bit is 52 in., which is the total end-to-end measurement including the SDS-Max shank. The working length - the portion of the bit that actively engages the material being drilled - is 47 in. This 47 in. working length allows the bit to reach deep into thick concrete structures for long-reach anchor setting applications.

What does the wear mark indicator do?

The wear mark indicator is a built-in reference point on the bit that helps the operator achieve precise hole depth consistently. It eliminates guesswork during anchor setting in reinforced concrete, ensuring each hole meets the depth requirements for reliable anchor performance.