The Diablo 1-3/4 in. x 16 in. x 21 in. Rebar Demon SDS-Max 4-Cutter Carbide-Tipped Hammer Drill Bit delivers a revolutionary approach to drilling through reinforced concrete, rebar, brick, and block. Engineered by Diablo for use with SDS-Max rotary hammer drills, this heavy-duty bit combines a full-carbide 4-cutter head, advanced heat resistance, and precision tip geometry to produce fast, accurate holes in the most demanding concrete drilling applications - including anchor setting in rebar-congested slabs and structural concrete.

Key Features

• Up to 7X longer life versus standard 2-cutter hammer drill bits - dramatically reduces bit replacement frequency and downtime on large concrete drilling jobs
• Diablo Dura-Carbide features up to 2X more carbide that withstands up to 1800 deg. Fahrenheit of intense heat versus standard bits that fail at 800 deg. Fahrenheit - keeps the cutting head intact and effective even after repeated rebar strikes
• Impact Resistant 4-Cutter Full Carbide Head extracts smaller bites of rebar for controlled, consistent carbide wear and reduced vibration - delivers fast, precise holes with less operator fatigue
• Tri-Metal Fusion Welding features up to 3X stronger weld to keep the full carbide head intact during extreme impact such as rebar - prevents head breakage and extends service life in high-stress conditions
• Precision Tip delivers stability and accuracy required for fast, precise holes - ensures accurate hole placement critical for anchor setting in reinforced concrete
• Optimized flute design removes dust faster, keeping the carbide head cooler for ultimate strength and durability - reduces heat buildup and maintains cutting performance over extended use
• Wear mark indicator ensures precise hole making - helps operators achieve consistent hole depth without guesswork
• Optimized for maximum performance in corded and cordless SDS-Max rotary hammers - compatible with a wide range of professional hammer drill tools

Why This Product

• Designed specifically to survive rebar hits - the 4-cutter full-carbide head takes small bites of rebar rather than absorbing full impact force, making it the right choice for drilling into reinforced concrete slabs and walls where rebar encounters are unavoidable
• Dramatically reduced heat failure risk - with heat tolerance up to 1800 deg. Fahrenheit compared to the 800 deg. Fahrenheit limit of standard bits, this bit maintains its cutting integrity through continuous heavy use that would destroy conventional hammer drill bits
• Fewer bit changes on the job - up to 7X longer service life versus standard 2-cutter bits means less interruption to workflow and lower overall cost per hole on concrete anchoring, structural, and masonry projects
• Precision and speed in one tool - the combination of Precision Tip geometry, optimized dust-clearing flutes, and a wear mark indicator makes this bit equally suited for high-volume production drilling and detail work requiring accurate hole placement

Specifications

• Manufacturer Part Number: DMAMX1390
• Brand: Diablo
• Category: SDS-Max 4-Cutter
• Diameter: 1-3/4 in.
• Length: 21 in.
• Working Length: 16 in.
• Shank: SDS Max
• Head Type: Carbide-Tipped
• 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

Frequently Asked Questions

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

The Rebar Demon uses a 4-cutter full-carbide head with Diablo Dura-Carbide that contains up to 2X more carbide than standard bits. This allows it to withstand up to 1800 deg. Fahrenheit of heat - more than double the 800 deg. Fahrenheit limit of standard bits - and deliver up to 7X longer life. The 4-cutter design also takes smaller bites of rebar, producing controlled carbide wear, reduced vibration, and consistently precise holes.

What rotary hammer tools is this bit compatible with?

This bit is designed for use with SDS-Max rotary hammer drills and is optimized for maximum performance in both corded and cordless SDS-Max rotary hammers.

What materials can this bit drill through?

This bit is rated for use in reinforced concrete, concrete, rebar, and brick/block. Its 4-cutter carbide head and impact-resistant construction make it particularly effective in reinforced concrete where rebar strikes are expected.

What do the working length and overall length measurements mean?

The overall length of this bit is 21 in., which is the total measurement from tip to end of shank. The working length is 16 in., which represents the usable cutting and flute depth available for drilling - the maximum depth of hole this bit can produce. These dimensions are important for selecting the right bit for deep anchor holes in thick concrete sections.