The Diablo Rebar Demon 5/16 in. x 16 in. x 18 in. SDS-Plus 4-Cutter Full Carbide Head Hammer Drill Bit is engineered for professionals who demand speed, durability, and precision when drilling through reinforced concrete, concrete, rebar, and brick or block. Designed by Diablo as part of their revolutionary Rebar Demon line, this hammer drill bit outpaces standard 2-cutter bits by delivering up to 7X longer life, faster hole completion, and significantly cooler operation during the most demanding anchor-setting and concrete drilling applications.

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 overall cost per hole.
• Diablo Dura-Carbide with up to 2X more carbide, withstanding up to 1800 deg. Fahrenheit of intense heat - standard bits fail at 800 deg. Fahrenheit, meaning this bit stays strong and functional in high-heat rebar-impact conditions where ordinary bits give out.
• Impact Resistant 4-Cutter Full Carbide Head extracts smaller bites of rebar - controlled, consistent carbide wear and reduced vibration result in fast, precise holes even when rebar is encountered mid-drill.
• Tri-Metal Fusion Welding produces a bond up to 3X stronger - the full carbide head stays intact during extreme impact events such as rebar strikes, preventing catastrophic head separation and keeping the bit drilling true.
• Precision Tip delivers stability and accuracy - ensures holes start exactly where intended for reliable anchor setting in reinforced concrete, reducing walk-off and wasted material.
• Optimized flute design removes dust faster - accelerated dust evacuation keeps the carbide head cooler during extended use, preserving ultimate strength and long-term durability.
• Wear mark indicator - provides a visual reference to ensure precise hole depth, eliminating guesswork during anchor installation.
• Optimized for corded and cordless SDS-Plus rotary hammers - compatible with a wide range of professional rotary hammer tools for maximum jobsite flexibility.

Why This Product

• When drilling into reinforced concrete where rebar hits are inevitable, the 4-cutter full carbide head absorbs impact by taking small, controlled bites rather than grinding the head down all at once - extending service life far beyond what a standard 2-cutter bit can offer.
• Heat is the silent killer of drill bits in concrete applications. Dura-Carbide's ability to withstand up to 1800 deg. Fahrenheit - more than double the 800 deg. Fahrenheit threshold where standard bits fail - means this bit keeps cutting when others stop.
• Tri-Metal Fusion Welding is not just marketing language - it directly addresses one of the most common failure modes in hammer drill bits: head separation under impact. A weld up to 3X stronger than conventional methods means the bit holds together when it matters most.
• Made in the United States, this 5/16 in. diameter bit with an 18 in. overall length and 16 in. working length fills a precise need for deep anchor holes in structural concrete applications where both reach and accuracy are critical.

Specifications

• Brand: Diablo
• Sub-Brand: Rebar Demon
• Manufacturer Part Number: DMAPL4130
• Category: SDS-Plus 4-Cutter
• Diameter: 5/16 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 for anchor setting and structural fastening applications

Frequently Asked Questions

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

The Rebar Demon features a 4-cutter full carbide head rather than the standard 2-cutter design. This means the bit takes smaller, more controlled bites of rebar on contact, reducing vibration and carbide wear while delivering up to 7X longer life. Combined with Tri-Metal Fusion Welding - which produces a weld up to 3X stronger than conventional methods - the full carbide head resists breakage even during severe rebar impacts.

Can this bit be used with a cordless SDS-Plus rotary hammer?

Yes. The Rebar Demon 5/16 in. SDS-Plus bit is optimized for maximum performance in both corded and cordless SDS-Plus rotary hammer drills, giving you flexibility across different jobsite tool setups.

Why is heat resistance so important for a hammer drill bit used in concrete?

Heat generated during concrete drilling - especially when rebar is encountered - is a primary cause of standard bit failure. Standard bits fail at around 800 deg. Fahrenheit. Diablo's Dura-Carbide material withstands up to 1800 deg. Fahrenheit of intense heat, more than double that threshold. Additionally, the optimized flute design on this bit removes dust faster, which actively keeps the carbide head cooler during extended drilling sessions.

What is the working length of this bit, and how does it differ from the overall length?

This bit has an overall length of 18 in. and a working length of 16 in. The working length is the portion of the bit available for actual drilling - the fluted section that cuts through material. The remaining length is accounted for by the SDS-Plus shank that seats into the rotary hammer. A 16 in. working length provides deep reach for structural anchor-setting in reinforced concrete applications.