The Simpson SDS-Plus Quad Head Carbide Drill Bit, 7/8 in. x 8 in. is a premium, professional-grade rotary hammer bit engineered to deliver consistent, high-speed performance in reinforced concrete drilling applications. Built on a chromium-nickel-molybdenum steel alloy body with uniformly brazed carbide inserts, this bit brings together proprietary design features and rigorous German manufacturing standards to meet the demands of contractors and tradespeople who need dependable precision and durability on every job. The 4 x 90 deg. Quad Head geometry sets this bit apart for rebar-heavy concrete work, while the SDS-plus shank ensures fast, tool-free bit changes with any compatible rotohammer.

Key Features

• Uniformly brazed carbide inserts - create a consistent, secure bond between the carbide tip and the steel body, extending overall bit life and reducing the risk of premature tip failure under heavy use.
• Centering tip design - facilitates easy spot drilling at the start of each hole, helping users maintain accurate hole placement without walking or slipping on the concrete surface.
• Chromium-nickel-molybdenum steel alloy body - delivers the toughness and resilience needed to withstand the repetitive hammering forces of rotary hammer drilling, supporting a long service life in demanding conditions.
• Heat-treatment procedures and shot-peened finish - increase surface hardness and resistance to bending forces, while also improving drilling speed and reducing wear over the life of the bit.
• 4 x 90 deg. Quad Head geometry - crushes through rebar and prevents sticking in reinforced concrete, keeping the bit moving efficiently rather than binding or deflecting mid-hole.
• High-volume, multi-flute spiral - rapidly channels concrete dust out of the hole during drilling, reducing friction and maintaining faster, cleaner drilling speeds in solid and reinforced concrete.
• Conforms to ANSI Standard B212.15 - ensures the bit meets established industry dimensional and performance tolerances, so it integrates reliably with SDS-plus rotohammers and meets professional jobsite requirements.
• SDS-plus shank - provides a secure, tool-free bit change and broad compatibility with SDS-plus rotohammers across major tool brands, minimizing downtime between tasks.

Why This Product

• Purpose-built for reinforced concrete - the 4 x 90 deg. Quad Head tip geometry is specifically designed to push through rebar rather than deflect or bind, making this bit a practical choice for anchor installation, structural drilling, and other tasks in rebar-dense slabs or walls.
• Professional-grade construction with verified quality standards - the combination of a chromium-nickel-molybdenum steel alloy body, uniformly brazed carbide inserts, heat-treatment, and shot-peened finish means this bit is built to hold up under the sustained stress of production-level concrete drilling, not just occasional use.
• Faster drilling with less cleanup - the high-volume, multi-flute spiral actively evacuates concrete dust during drilling, which keeps the cutting zone clear, reduces heat buildup, and helps maintain consistent speed from the first hole to the last.
• Trusted Simpson Strong-Tie engineering - Simpson offers a complete line of carbide-tipped drill bits, core bits, and chisels manufactured to precise tolerance requirements, so professionals working with Simpson anchoring systems can use a compatible, properly matched bit for accurate hole sizing and reliable fastener performance.

Specifications

• Model Number: MDPL08708Q
• Diameter: 7/8 in.
• Overall Length: 8 in.
• Drilling Depth: 6 in.
• Shank Type: SDS-plus
• Head Type: Quad Head 4x Drill Bit
• Material: Hardened Steel with Carbide Tip
• Conforms To: ANSI Standard B212.15
• Country of Origin: Germany

Frequently Asked Questions

What type of shank does the MDPL08708Q use, and which rotohammers is it compatible with?

The MDPL08708Q features an SDS-plus shank, which provides a secure, tool-free bit change and is compatible with all SDS-plus rotohammers. This is the industry-standard shank format supported by rotohammers from many major tool brands.

What makes the Quad Head geometry on this drill bit different from a standard tip?

The 4 x 90 deg. Quad Head geometry is specifically designed to crush through rebar encountered in reinforced concrete while also preventing the bit from sticking or binding during drilling. This provides greater efficiency and control compared to standard drill bit tip designs.

What is the actual drilling depth of this bit?

While the overall length of the MDPL08708Q is 8 inches, the effective drilling depth is 6 inches. This distinction is important when planning anchor depths or hole depths for fastening applications.

What quality standards and materials are used in the construction of this drill bit?

This drill bit is built from a chromium-nickel-molybdenum steel alloy body and features uniformly brazed carbide inserts. It undergoes heat-treatment procedures and a shot-peened finish to increase surface hardness and resist wear. The bit also conforms to ANSI Standard B212.15, ensuring it meets established dimensional and performance requirements.

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