Engineered specifically for SDS-Plus rotary hammers, both corded and cordless, this 2-Cutter carbide-tipped stop bit pairs aggressive material removal with a durable carbide edge. The advanced brazing and hardening process locks the carbide tips in place for extended life in tough concrete, masonry, and similar substrates. The built-in Stop Collar defines a pre-determined depth, making shallow anchor installations accurate and repeatable without guesswork.

• Diameter and length: 5/8" diameter, 1-3/16" overall length optimize performance in common concrete anchor depths.
• 2-Cutter design: Two sharp cutting edges reduce walking and maximize material removal for cleaner holes with less torque.
• Carbide-tipped: Hardened carbide tips resist chipping and wear, delivering longer bit life under demanding drilling schedules.
• Stop Collar feature: Pre-set stopping point ensures consistent depths for shallow anchors, reducing over-drilling and improving installation efficiency.
• SDS-Plus compatibility: Optimized for use in both corded and cordless SDS-Plus rotary hammers, providing reliable performance across job sites.

Why this stop bit stands out

What sets the Diablo DMAST1040 apart is the combination of a robust carbide edge, a practical Stop Collar, and a cutting geometry tuned for concrete. The result is a drill bit that can cut quickly through dense material while maintaining depth precision, which is essential when working with anchors, fasteners, or anchor bolts. The 2-Cutter design minimizes dwell time and reduces wobble, so you get more accurate holes with less effort—particularly important in overhead or confined-space drilling.

Ideal use cases

• Anchor installations in concrete slabs and walls where precise depth is critical.
• Shallow boreholes for fasteners and anchors that require a defined stopping point.
• Projects using SDS-Plus rotary hammers in both professional construction and serious DIY tasks.

Practical insights for maximum value

To get the most from the Diablo DMAST1040, pair it with a quality SDS-Plus hammer and operate at appropriate speeds for concrete drilling. Let the bit do the work—avoid excessive feed pressure, maintain steady drill speed, and allow the carbide tips to do the cutting. When working in reinforced concrete, the carbide tips excel at maintaining edge integrity, helping you complete drilling tasks with fewer bit changes.

With the DMAST1040, you’re choosing a drill bit that combines speed, durability, and precise depth control—designed to meet the needs of professionals who demand reliable performance from their concrete drilling tools.