The Diablo 5/8" x 16" x 21" Rebar Demon SDS-Max 4-Cutter Full Carbide Head Hammer Drill Bit is engineered for professionals who demand speed, precision, and durability when drilling through reinforced concrete, standard concrete, brick, and block. Designed around Diablo's revolutionary Dura-Carbide technology, this SDS-Max rotary hammer bit delivers up to 7X longer life compared to standard 2-cutter bits - making it the go-to solution for anchor setting, heavy demolition prep, and high-volume drilling in rebar-laden concrete structures.

Key Features

• Up to 7X longer life versus standard 2-cutter hammer drill bits - dramatically reduces bit replacement frequency and total cost per hole on the job site.
• Dura-Carbide with up to 2X more carbide - withstands up to 1800 deg. Fahrenheit of intense heat, whereas standard bits fail at 800 deg. Fahrenheit, keeping the bit functional through rebar strikes that would destroy conventional bits.
• Impact Resistant 4-Cutter Full Carbide Head - extracts smaller bites of rebar for controlled, consistent carbide wear and reduced vibration, delivering fast and precise holes even in heavily reinforced slabs.
• Tri-Metal Fusion Welding with up to 3X stronger weld - keeps the full carbide head intact during extreme impact such as rebar contact, preventing head breakage that could halt work or damage equipment.
• Precision Tip - delivers the stability and accuracy required for fast, precise holes, reducing bit walk-off and keeping anchor placements on layout.
• Optimized flute design - removes dust faster, keeping the carbide head cooler for ultimate strength and durability during extended drilling sessions.
• Wear mark indicator - ensures precise hole making by giving the operator a clear visual reference for consistent hole depth during anchor setting.
• Optimized for corded and cordless SDS-Max rotary hammers - delivers maximum performance across a wide range of professional hammer drill platforms without sacrificing speed or bit life.

Why This Product

• Contractors drilling into rebar-reinforced concrete no longer need to treat rebar strikes as a bit-killing event - the 4-Cutter Full Carbide Head is specifically designed to take controlled bites of rebar, extending service life up to 7X over standard 2-cutter bits and keeping projects moving without constant bit changes.
• The Dura-Carbide formulation tolerates up to 1800 deg. Fahrenheit - more than double the heat threshold of standard bits - meaning this bit stays structurally sound through the punishing thermal cycles generated by high-powered SDS-Max hammer drills in dense concrete applications.
• Tri-Metal Fusion Welding provides a weld that is up to 3X stronger than conventional bonding methods, so the carbide head stays attached and intact even under the shock loads generated by hitting embedded rebar, reducing the risk of catastrophic bit failure mid-hole.
• The optimized flute geometry actively clears concrete dust from the cutting zone, lowering operating temperature at the tip and translating directly into maintained carbide hardness and more holes per bit over the course of a job.

Specifications

• Brand: Diablo
• Manufacturer Part Number: DMAMX1100
• Diameter: 5/8"
• Length: 21"
• Working Length: 16"
• Shank: SDS Max
• Head Type: Full Carbide Head
• Number of Cutters: 4
• Compatible Tools: SDS-Max Rotary Hammer Drill
• Compatible 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 SDS-Max drill bit?

The Rebar Demon uses a 4-Cutter Full Carbide Head produced with Tri-Metal Fusion Welding, which is up to 3X stronger than standard welds. The Dura-Carbide material withstands up to 1800 deg. Fahrenheit of heat - compared to 800 deg. Fahrenheit for standard bits - and the 4-cutter geometry takes smaller bites of rebar for controlled wear and reduced vibration. Together these features deliver up to 7X longer bit life versus standard 2-cutter hammer drill bits.

Can this bit be used with cordless SDS-Max rotary hammers?

Yes. This bit is optimized for maximum performance in both corded and cordless SDS-Max rotary hammer drills.

What is the usable working length of this bit?

The working length - the portion of the bit actively engaged in drilling - is 16". The overall length of the bit is 21", with the remaining length accounted for by the SDS-Max shank and flute transition.

How does the wear mark indicator help during anchor setting?

The wear mark indicator provides a clear visual reference on the bit body, allowing the operator to gauge hole depth accurately without stopping to measure. This is especially useful during anchor setting in reinforced concrete, where consistent hole depth is critical to proper anchor performance.