The Diablo 1-1/8" x 47" x 52" 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, and brick or block. Built on Diablo's revolutionary Rebar Demon platform, this large-diameter SDS-Max bit combines a full carbide head, proprietary Dura-Carbide material, and precision flute geometry to deliver results that standard 2-cutter bits simply cannot match - especially in rebar-laden concrete where heat and impact routinely destroy lesser bits.

Key Features

• Up to 7X longer life versus standard 2-cutter hammer drill bits - meaning fewer bit changes, less downtime, and a lower cost per hole on demanding jobsites
• Diablo Dura-Carbide with up to 2X more carbide withstands up to 1800 deg. Fahrenheit of intense heat - where standard bits fail at 800 deg. Fahrenheit, this bit keeps cutting through rebar hits 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, precise holes even in heavily reinforced slabs
• Tri-Metal Fusion Welding features up to 3X stronger weld to keep the full carbide head intact during extreme impact such as rebar - preventing head separation and protecting operator safety
• Precision Tip delivers stability and accuracy required for fast, precise holes - critical for anchor setting in reinforced concrete where hole placement tolerances are tight
• Optimized flute design removes dust faster, keeping the carbide head cooler for ultimate strength and durability - reducing the heat buildup that causes premature wear in continuous drilling operations
• Wear mark indicator ensures precise hole making - giving operators a reliable depth reference without additional measurement steps
• Optimized for maximum performance in corded and cordless SDS-Max rotary hammers - providing versatile compatibility across a wide range of professional tool platforms

Why This Product

• Rebar is the number one cause of premature bit failure in concrete drilling - the 4-cutter full carbide head and Dura-Carbide material are specifically engineered to handle rebar contact with controlled wear rather than catastrophic failure, making this the right choice for reinforced concrete applications
• At a 1 1/8" diameter and 47" working length, this bit reaches deep anchor holes in thick reinforced slabs and structural concrete that shorter, narrower bits cannot access - reducing the need for multiple drilling passes or extensions
• The combination of Tri-Metal Fusion Welding and up to 1800 deg. Fahrenheit heat resistance means this bit sustains performance under the extreme conditions generated by high-powered rotary hammers driving through concrete with rebar - conditions that cause standard bits to fail at 800 deg. Fahrenheit
• The optimized flute design actively clears concrete dust during drilling, keeping the cutting head cooler and maintaining carbide integrity over longer run times - resulting in faster drilling speeds and a longer service life per bit

Specifications

• Brand: Diablo
• Model Number: DMAMX1285
• Category: SDS-Max 4-Cutter
• Diameter: 1-1/8"
• Length: 52"
• Working Length: 47"
• 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

Frequently Asked Questions

How does this bit perform differently when it hits rebar compared to a standard 2-cutter bit?

The 4-cutter full carbide head is designed to take small, controlled bites of rebar rather than absorbing the full shock in a single cutting edge. This approach delivers controlled carbide wear, reduced vibration, and up to 7X longer life compared to standard 2-cutter hammer drill bits. The Tri-Metal Fusion Welding also keeps the carbide head from separating under the extreme impact of repeated rebar contact.

What makes Dura-Carbide different from the carbide used in standard hammer drill bits?

Dura-Carbide is Diablo's proprietary carbide formulation that incorporates up to 2X more carbide material than standard bits. This increased carbide content allows the bit to withstand up to 1800 deg. Fahrenheit of intense heat generated during drilling - a critical advantage because standard bits begin to fail at 800 deg. Fahrenheit, particularly after rebar contact.

Is this bit compatible with both corded and cordless rotary hammers?

Yes. This bit is optimized for maximum performance in both corded and cordless SDS-Max rotary hammers, giving professionals flexibility across different power tool platforms without sacrificing drilling speed or bit longevity.

What is the purpose of the wear mark indicator on this bit?

The wear mark indicator is a built-in reference feature that ensures precise hole making by providing a clear visual guide for depth control during drilling. This is especially useful for anchor setting applications in reinforced concrete where consistent, accurate hole depth is required.