The Diablo DMAPL4310 Rebar Demon SDS-Plus 4-Cutter Full Carbide Head Hammer Drill Bit is a 1 inch x 16 inch x 18 inch rotary hammer bit built for drilling anchor and pass-through holes in concrete, reinforced concrete, block, brick, stone, and natural stone. This is a hammer drill bit designed for drilling masonry and concrete, especially concrete with rebar. Model Number: DMAPL4310. If your work puts you into reinforced slabs, walls, or structural concrete, this is the kind of bit you buy to avoid burning time and ruining bits every time you touch steel.

What separates this bit from a standard masonry bit is the full carbide head with four cutters. Instead of a simpler two-cutter layout, the Diablo Rebar Demon head is built to stay intact and keep the hole on track when the bit meets rebar. Diablo states that the head takes smaller bites of rebar for controlled carbide wear and reduced vibration. On the job, that means a cleaner, more predictable hole and less of that sudden grab or deflection that can throw off anchor placement.

At 1 inch diameter with an 18 inch overall length and 16 inch working length, the Diablo DMAPL4310 is sized for deep drilling where reach matters. That extra usable length helps when you need to get through thick material, set deeper anchors, or drill clean holes without coming up short. The SDS-Plus shank keeps the bit locked into the rotary hammer for efficient energy transfer, which is what you want when drilling larger diameter holes in concrete.

Diablo also puts a lot of emphasis on durability here, and the product data supports that. The Dura-Carbide formulation is listed as having up to 2 times more carbide and the ability to withstand temperatures up to 1800 degrees Fahrenheit, compared to standard bits that fail around 800 degrees Fahrenheit. Add in the Tri-Metal Fusion Welding, rated for up to 3 times stronger weld strength, and the point is pretty clear: this bit is built to survive the kind of repeated impact and heat that kill cheaper bits fast.

Dust removal matters more than a lot of people think on a concrete bit, especially on larger diameters. Diablo uses an optimized flute design to move dust out faster and keep the head cooler. In real use, that helps the bit maintain drilling speed, reduces heat buildup at the cutting end, and supports better life when you are drilling multiple holes back to back. The precision tip and wear mark indicator also help with hole accuracy and consistency, which is important for anchor setting where hole size and depth cannot be sloppy.

Compatibility is straightforward. This bit uses an SDS-Plus shank and is optimized for corded and cordless SDS-Plus rotary hammers. Diablo also notes performance optimization across SDS-Plus or SDS-Max rotary hammer platforms where applicable to the system, but the bit itself is specifically an SDS-Plus shank bit, so your tool needs the correct SDS-Plus interface. It is not a general-purpose drill bit for a standard 3-jaw chuck.

Material coverage is broad for masonry work. This bit is intended for concrete, concrete with rebar, reinforced concrete, block, brick, stone, and natural stone. That makes it a strong fit for concrete anchoring, electrical and mechanical penetrations, railing and post installs, wedge anchor holes, and renovation work where you do not always know what is buried in the slab until you hit it.

If you are a contractor, installer, electrician, mechanical tradesman, or serious DIYer who drills larger holes in cured concrete, this bit makes sense. If you rarely touch rebar or only drill occasional small anchor holes, a cheaper standard bit may get you by. But if hitting steel is part of the job, the Diablo DMAPL4310 is the better call because it is built specifically for the problem that ruins ordinary hammer drill bits.

Diablo DMAPL4310 Rebar Demon SDS-Plus 4-Cutter Full Carbide Head Hammer Drill Bit means business

This is the kind of concrete bit you buy when hitting rebar is not a surprise, it is just part of the work.

• Who it's for: Pros and serious users drilling larger holes in reinforced concrete, setting anchors, or doing install work where clean, accurate holes matter.
• Why it stands out: The full carbide 4-cutter head, deep 16 inch working length, and SDS-Plus design are all aimed at faster drilling, better durability, and fewer ruined bits when steel shows up.
• Worth knowing: This is a single SDS-Plus bit, not a kit, and it is purpose-built for rotary hammer use. Make sure your tool has an SDS-Plus holder before you order it.

• What tool type does this bit fit? It fits rotary hammers that use an SDS-Plus shank connection.
• Can this bit drill through concrete with rebar? Yes. The Diablo Rebar Demon line is specifically designed for concrete with rebar and uses a full carbide 4-cutter head for that application.
• What is the usable drilling depth? The listed working length is 16 inches, with an overall bit length of 18 inches.
• What materials is it made for? It is designed for concrete, reinforced concrete, block, brick, stone, and natural stone.