The Diablo Rebar Demon 7/8" x 16" x 18" SDS-Plus 4-Cutter Full Carbide Head Hammer Drill Bit is engineered for professionals who demand maximum durability and speed when drilling through reinforced concrete, rebar, brick, and block. Designed as part of Diablo's revolutionary Rebar Demon lineup, this hammer drill bit delivers up to 7X longer life compared to standard 2-cutter bits - making it the go-to solution for anchor setting, utility penetrations, and structural drilling in demanding job-site conditions. With a full carbide head produced using Tri-Metal Fusion Welding, an optimized flute design for faster dust removal, and a Dura-Carbide formula rated to withstand up to 1800 deg. Fahrenheit, this bit pushes performance boundaries where standard bits fail.

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.
• Dura-Carbide with up to 2X more carbide - withstands up to 1800 deg. Fahrenheit of intense heat, compared to standard bits that fail at 800 deg. Fahrenheit, allowing continuous drilling through rebar without premature breakdown.
• 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 heavily reinforced concrete.
• Tri-Metal Fusion Welding with up to 3X stronger weld - keeps the full carbide head intact during extreme impacts such as rebar strikes, preventing head separation and maintaining bit integrity in high-stress applications.
• Precision Tip - provides the stability and accuracy required for fast, precise hole placement in reinforced concrete, which is critical for proper anchor setting and structural applications.
• Optimized flute design removes dust faster - keeps the carbide head cooler during drilling, preserving ultimate strength and durability over longer run times without overheating.
• Wear mark indicator - ensures precise hole depth making so anchors seat correctly and consistently without guesswork.
• Optimized for corded and cordless SDS-Plus rotary hammers - delivers maximum performance whether you are on a corded rig or a battery-powered rotary hammer, providing job-site flexibility without sacrificing output.

Why This Product

• Drilling through rebar is one of the most punishing tasks for any hammer drill bit - this bit's 4-cutter full carbide head is specifically designed to handle rebar contact with controlled carbide wear and reduced vibration, preventing the sudden failure common in standard bits.
• The Dura-Carbide formula tolerates heat up to 1800 deg. Fahrenheit - more than double the 800 deg. Fahrenheit threshold where standard bits break down - making this bit the right choice for high-output drilling sessions in dense reinforced concrete.
• At 7/8" diameter with a 16" working length and 18" overall length, this bit reaches deep drilling applications - such as through-wall anchor setting and penetrations in thick reinforced concrete slabs - without requiring extensions.
• Produced in Germany with Tri-Metal Fusion Welding, this bit pairs heat resistance with structural integrity at the head joint, reducing the risk of catastrophic bit failure during heavy hammer use.

Specifications

• Brand: Diablo
• Sub-Brand: Rebar Demon
• Model Number: DMAPL4290
• Category: SDS-Plus 4-Cutter
• Diameter: 7/8"
• Length: 18"
• Working Length: 16"
• Shank: SDS-Plus
• Head Type: Full Carbide Head
• Number of Cutters: 4
• Compatible Tools: SDS-Plus 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 penetrations

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 that takes smaller, controlled bites of rebar rather than absorbing the full impact at once. This results in reduced vibration, controlled carbide wear, and up to 7X longer life compared to standard 2-cutter bits. In addition, the Dura-Carbide formula handles heat up to 1800 deg. Fahrenheit, while standard bits fail at 800 deg. Fahrenheit.

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

Yes. This bit is optimized for maximum performance in both corded and cordless SDS-Plus rotary hammer drills, giving you flexibility across different tool setups on the job site.

What is the working length of this bit, and why does it matter?

This bit has a working length of 16" within an overall length of 18". The working length determines how deep a hole can be drilled - 16" of usable cutting depth makes this bit well suited for deep anchor installations and through-wall penetrations in thick reinforced concrete.

What is Tri-Metal Fusion Welding and why is it important for rebar drilling?

Tri-Metal Fusion Welding is the process used to bond the full carbide head to the bit body. It produces a weld that is up to 3X stronger than standard welding methods, keeping the carbide head intact during the extreme impact forces generated when the bit strikes rebar in reinforced concrete - preventing head separation and maintaining safe, consistent performance.