The Simpson 7/8 in. x 12 in. SDS-Plus Quad Head Carbide Drill Bit is a premium-quality, professional-grade rotary hammer bit engineered for demanding concrete and masonry drilling applications, including work in reinforced concrete where rebar contact is expected. Built to precise tolerance requirements and conforming to ANSI Standard B212.15, this carbide-tipped bit combines proprietary material science with an advanced four-point head geometry to deliver faster drilling, longer service life, and reliable performance in the toughest conditions.

Key Features

• Uniformly brazed carbide inserts - consistent bonding across the entire cutting tip means the bit holds up longer under repeated hammering, reducing replacement frequency on the job.
• Centering tip design - facilitates easy spot drilling so the bit stays on target from the first strike, eliminating wander and improving hole placement accuracy.
• Chromium-nickel-molybdenum steel alloy body - this high-grade alloy construction ensures the shank and body withstand sustained hammering forces for an extended service life.
• Heat-treatment procedures and shot-peened finish - increase surface hardness and resistance to bending forces, while also improving drilling speed and reducing overall bit wear during heavy use.
• High-volume, multi-flute spiral - quickly channels concrete dust away from the hole during drilling, keeping the cutting zone clear to maintain consistent speed and prevent clogging.
• 4 x 90 deg. Quad Head geometry - crushes through rebar and prevents sticking in reinforced concrete, keeping work moving without costly downtime or bit damage when steel is encountered.
• SDS-plus shank - provides a tool-free, secure quick-connect fit with SDS-plus rotary hammers, ensuring a play-free connection that transfers hammering energy efficiently to the bit.
• Conforms to ANSI Standard B212.15 - meets established industry dimensional and performance standards, giving professionals confidence in consistent sizing and interoperability.

Why This Product

• Built for reinforced concrete without compromise - the 4 x 90 deg. Quad Head tip geometry is specifically engineered to crush through rebar rather than deflect or bind, making this bit a practical choice for structural concrete work where standard bits struggle.
• Professional-grade materials engineered for longevity - the combination of a chromium-nickel-molybdenum alloy body, uniformly brazed carbide inserts, and a heat-treated shot-peened finish means the bit resists wear, bending, and premature failure even under continuous heavy-duty use.
• Faster, cleaner drilling with less effort - the multi-flute high-volume spiral actively removes concrete dust from the hole as you drill, so the cutting edge stays effective and drilling speed stays high without frequent bit withdrawal to clear debris.
• Precision engineering to exact tolerances - manufactured to meet precise dimensional requirements and ANSI Standard B212.15, this bit delivers predictable, repeatable hole diameters that matter when setting anchors, fasteners, or other hardware with tight fit requirements.

Specifications

• MPN: MDPL08712Q
• Brand: Simpson Strong-Tie
• Diameter: 7/8 in.
• Overall Length: 12 in.
• Drilling Depth: 10 in.
• Shank Type: SDS-plus Shank
• Head Type: Quad Head 4x Drill Bit
• Material: Hardened Steel
• Standards Compliance: ANSI Standard B212.15
• Country of Origin: Germany

Frequently Asked Questions

What type of shank does the MDPL08712Q use, and which rotary hammers is it compatible with?

The MDPL08712Q features an SDS-plus shank, which is the industry-standard quick-connect system compatible with SDS-plus rotary hammers. This shank type allows for tool-free bit changes and ensures a secure, play-free connection during hammering operations.

What makes the Quad Head tip geometry beneficial when drilling in reinforced concrete?

The 4 x 90 deg. Quad Head geometry is specifically engineered to crush through rebar and prevent the bit from sticking in reinforced concrete. This design distributes cutting forces more evenly, reducing the risk of bit damage and keeping the drilling process moving efficiently even when rebar is encountered.

What is the actual usable drilling depth of the MDPL08712Q, and how does it differ from the overall length?

The MDPL08712Q has an overall length of 12 in., but the usable drilling depth is 10 in. The difference accounts for the SDS-plus shank engagement in the tool chuck, meaning 10 in. of that total length is available for effective material penetration.

How does the construction of this drill bit contribute to its durability and performance?

The bit body is constructed from a chromium-nickel-molybdenum steel alloy, which provides excellent hammering quality and extended service life. Combined with heat-treatment procedures and a shot-peened finish, the bit achieves increased surface hardness, improved resistance to bending forces, and reduced wear during high-demand drilling applications. Uniformly brazed carbide inserts further contribute to consistent, long-lasting performance.

Note: Product dimensions may differ from picture. Please see the item description above for specifications.