Diablo Hammer Drill Bit DMAPL4290 7/8 Inch (SDS Plus Rebar Demon 4 Cutter Full Carbide Head 18 Inch Length Deep Concrete Anchoring 7X Life)

Diablo DMAPL4290 7/8-Inch x 18-Inch SDS-Plus Rebar Demon 4-Cutter Full Carbide Head Hammer Drill Bit

The Diablo DMAPL4290 7/8-Inch x 18-Inch SDS-Plus Rebar Demon Hammer Drill Bit is a heavy-duty masonry drilling accessory engineered to bore deep anchor holes through rebar-reinforced concrete, hard aggregate, and structural masonry. Constructed with a 4-cutter solid Dura-Carbide head joined by Tri-Metal Fusion Welding, an SDS-Plus shank, a 16-inch working depth, and a 18-inch overall length, this bit withstands thermal temperatures up to 1,800°F. Operating in corded and cordless SDS-Plus rotary hammers, this rebar-cutting bit delivers up to 7X longer lifespan compared to standard 2-cutter bits, solving head shear, rebar binding, and thermal fatigue during deep commercial concrete anchoring.

Best Used For:

• Deep Structural Rebar Anchoring: Drilling 7/8-inch diameter anchor holes through embedded steel rebar mesh and high-PSI concrete.
• Foundation & Slab Through-Hole Boring: Penetrating deep 16-inch concrete slabs and masonry foundation walls for conduit or pipe pass-throughs.
• High-Impact Rotary Hammer Drilling: Operating continuously in heavy SDS-Plus rotary hammers without carbide head detachment or thermal breakdown.

Key Performance & Safety Features

• 4-Cutter Full Carbide Head Architecture: Solid carbide head design prevents binding and shattering when encountering embedded steel rebar.
• Up to 7X Longer Operating Life: Premium Dura-Carbide formulation provides up to 7X longer service life than conventional 2-cutter hammer drill bits.
• Extreme 1,800°F Heat Resistance: Proprietary Dura-Carbide matrix retains cutting edge hardness under intense friction generated during continuous rebar strikes.
• Tri-Metal Fusion Welded Construction: High-strength brazing process creates a joint up to 3X stronger to hold the carbide head intact under heavy shock loads.
• Optimized High-Volume Dust Flutes: Fast-evacuating flute geometry channels concrete dust away rapidly to reduce friction and keep the cutting head cool.
• Precision Centering Tip & Wear Mark Indicator: Precision tip prevents bit walking during start-up, while the wear mark ensures holes remain within ANSI anchor tolerance.

What's Included

• (1) Diablo DMAPL4290 7/8 in. x 18 in. SDS-Plus Rebar Demon 4-Cutter Hammer Drill Bit

Technical Specifications

Pro-Tip: When drilling deep 16-inch holes, periodically retract the bit slightly without stopping the hammer drill to clear out packed concrete dust from the flutes and prevent thermal binding.