The Diablo 7/8" x 16" x 21" Rebar Demon 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, brick, and block. Diablo designed this heavy-duty SDS-Max bit to outlast conventional 2-cutter bits by up to 7X, making it the go-to solution for anchor setting, structural drilling, and any application where rebar contact is unavoidable. Built in Germany with full-carbide construction and advanced Tri-Metal Fusion Welding, this bit delivers the heat resistance, impact strength, and precision needed to keep rotary hammer operations running at peak efficiency.

Key Features

• Up to 7X longer life versus standard 2-cutter hammer drill bits - dramatically reduces bit replacement frequency on demanding jobsites, lowering overall tool cost per hole.
• Dura-Carbide formulation with up to 2X more carbide - withstands up to 1,800 deg. Fahrenheit of intense heat generated by rebar contact, compared to standard bits that fail at just 800 deg. Fahrenheit, keeping the bit cutting longer under extreme conditions.
• Impact Resistant 4-Cutter Full Carbide Head - extracts smaller bites of rebar for controlled, consistent carbide wear and reduced vibration, resulting in fast, 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 impact such as rebar strikes, preventing catastrophic head failure and protecting both the bit and the operator.
• Precision Tip geometry - delivers the stability and accuracy required for fast, precise holes in reinforced concrete, making it especially effective for anchor setting applications.
• Optimized flute design - removes dust faster from the hole, keeping the carbide head cooler for ultimate strength and long-term durability during sustained drilling operations.
• Wear mark indicator - ensures precise hole depth control, eliminating guesswork during anchor setting or through-hole drilling.
• Compatible with corded and cordless SDS-Max rotary hammers - provides maximum flexibility across jobsite tool setups without sacrificing performance.

Why This Product

• When drilling through reinforced concrete where rebar contact is likely, standard 2-cutter bits fail quickly at heat levels above 800 deg. Fahrenheit - this bit's Dura-Carbide head handles up to 1,800 deg. Fahrenheit, keeping work moving without frequent bit changes.
• The 4-cutter full carbide head with Tri-Metal Fusion Welding addresses the most common failure point in hammer drill bits - head separation and rapid carbide wear - giving crews a bit that holds together through the toughest poured concrete applications.
• With a 16" working length and 21" overall length, this bit reaches deep into concrete structures for long-reach anchor setting or through-slab drilling where shorter bits simply cannot reach.
• Reduced vibration from the 4-cutter design means less operator fatigue over long drilling sessions, making this bit a practical choice for high-volume drilling in reinforced concrete environments.

Specifications

• Brand: Diablo
• Manufacturer Part Number: DMAMX1180
• Diameter: 7/8"
• Length: 21"
• Working Length: 16"
• Shank: SDS Max
• Head Type: Full Carbide Head
• Number of Cutters: 4
• Compatible Tools: SDS-Max Rotary Hammer Drill
• Materials: Reinforced Concrete; Concrete; Rebar; Brick/Block
• Pack Quantity: 1
• Country of Origin: Germany

Approved Applications

• Reinforced concrete and concrete drilling

Frequently Asked Questions

What makes this bit different from a standard 2-cutter hammer drill bit?

This Diablo Rebar Demon features a 4-cutter full carbide head with Dura-Carbide that contains up to 2X more carbide than standard bits. It withstands up to 1,800 deg. Fahrenheit of heat versus only 800 deg. Fahrenheit for standard bits, and delivers up to 7X longer life. The 4-cutter design takes smaller bites of rebar for controlled wear and reduced vibration, while Tri-Metal Fusion Welding keeps the carbide head intact during extreme impact.

What shank type does this bit use, and which tools is it compatible with?

This bit uses an SDS-Max shank and is optimized for maximum performance in corded and cordless SDS-Max rotary hammer drills.

Can this bit drill through rebar inside concrete?

Yes. The Rebar Demon is specifically engineered for reinforced concrete where rebar contact is expected. The impact resistant 4-cutter full carbide head takes small, controlled bites of rebar to reduce vibration and deliver consistent carbide wear, rather than causing sudden failure as seen with standard bits. It is also suitable for concrete, brick, and block.

What do the overall length and working length measurements mean for my application?

The overall length of 21" is the total length of the bit from tip to end of shank. The working length of 16" is the fluted portion available for active drilling. For deep anchor setting or through-hole applications in thick reinforced concrete slabs, the 16" working length provides the reach needed to complete the hole at the required depth.