The Diablo Rebar Demon SDS-Max 4-Cutter Full Carbide Head Hammer Drill Bit (3/4 in. x 16 in. x 21 in.) is engineered for professionals who demand speed, durability, and precision when drilling through reinforced concrete, standard concrete, brick, and block. Built around Diablo's Dura-Carbide technology, this SDS-Max bit handles rebar strikes that would destroy conventional 2-cutter bits - delivering controlled, consistent performance even under the extreme stress of high-powered rotary hammer drilling. Whether you are setting anchors in rebar-dense structural concrete or working with a cordless SDS-Max hammer, this bit is designed to outlast and outpace standard hammer drill bits by a significant margin.

Key Features

• Up to 7X longer life versus standard 2-cutter hammer drill bits - fewer bit changes on the job means less downtime and greater productivity over long drilling sessions.
• Dura-Carbide with up to 2X more carbide - withstands up to 1800 deg. Fahrenheit of intense heat versus standard bits that fail at 800 deg. Fahrenheit, keeping the cutting head intact when rebar is encountered.
• 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 the most demanding reinforced concrete applications.
• Tri-Metal Fusion Welding with up to 3X stronger weld - keeps the full carbide head intact during extreme impact such as rebar hits, preventing head separation and extending reliable working life.
• Precision Tip geometry - delivers the stability and accuracy required for fast, precise holes, making anchor setting in reinforced concrete more consistent and repeatable.
• Optimized flute design removes dust faster - keeping the carbide head cooler for ultimate strength and durability, reducing heat buildup that would otherwise accelerate wear.
• Wear mark indicator - ensures precise hole depth making so anchors are seated correctly without over-drilling or guesswork.
• Compatible with corded and cordless SDS-Max rotary hammers - optimized for maximum performance across a wide range of professional tool platforms.

Why This Product

• Drilling into reinforced concrete with a standard 2-cutter bit risks rapid wear or breakage when the bit contacts rebar - the 4-cutter full carbide head and Dura-Carbide formula are specifically designed to handle rebar impact, making this bit the right choice for any application where rebar is present or suspected.
• The combination of Tri-Metal Fusion Welding and heat resistance up to 1800 deg. Fahrenheit addresses the two most common causes of premature bit failure - head separation and heat-related carbide degradation - so crews can drill more holes per bit and reduce consumable costs.
• At 16 in. working length with a 21 in. overall length on a 3/4 in. diameter, this bit reaches deep anchor points in thick concrete slabs and walls where shorter bits cannot, making it well suited for structural and commercial concrete work.
• The optimized flute design and wear mark indicator together support both speed and accuracy - faster dust evacuation means cooler operation and longer carbide life, while the depth indicator ensures consistent anchor embedment on every hole.

Specifications

• Brand: Diablo
• Model Number: DMAMX1140
• Category: SDS-Max 4-Cutter
• Diameter: 3/4 in.
• Overall Length: 21 in.
• Working Length: 16 in.
• Shank: SDS Max
• Head Type: Full Carbide Head
• Number of Cutters: 4
• Compatible Tools: SDS-Max Rotary Hammer Drill
• Materials Drilled: 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 features a 4-cutter full carbide head with Dura-Carbide that contains up to 2X more carbide material than a standard bit. This allows it to withstand up to 1800 deg. Fahrenheit of heat - more than double the 800 deg. Fahrenheit threshold where standard bits fail - and delivers up to 7X longer life by taking controlled, smaller bites of rebar rather than sustaining a single catastrophic impact.

What shank type does this bit use, and which tools are compatible?

This bit uses an SDS Max shank, which is the heavy-duty standard found on professional-grade rotary hammer drills. It is optimized for maximum performance in both corded and cordless SDS-Max rotary hammers.

What is the working length versus the overall length of this bit?

The overall length of the bit is 21 in., while the working length - the usable drilling depth - is 16 in. This makes it suitable for deep anchor holes in thick concrete walls and structural slabs where extended reach is required.

Can this bit be used on materials other than concrete?

Yes. In addition to reinforced concrete and standard concrete, this bit is rated for use in rebar, brick, and block - covering the most common masonry substrates encountered in commercial and residential construction and renovation work.