Milwaukee SDS MAX 4-Cutter Masonry Drill Bit, 7/8"X12"X17"

The 48-20-3945 Milwaukee SDS MAX 4-Cutter Masonry Drill Bit (7/8" x 12" x 17") is a high-durability concrete and masonry bit engineered for demanding drilling—especially in concrete with rebar. Its solid head carbide delivers up to 5X longer life in rebar-reinforced concrete, while rebar guards add durability in hard aggregate. A 4-cutter design helps prevent lock-up in rebar to reduce downtime, and the sharp centering tip supports exact spot drilling in concrete and metal decking. Optimized flutes remove dust faster to reduce heat and can deliver up to 15% more holes per battery charge. It meets ANSI B212.15 for compatibility with common anchors and includes wear mark indicators to show end of life and when the bit no longer meets ANSI requirements.

Country of Origin
Made in Germany

Key Features / Specifications

• Model / Part Number: 48-20-3945
• Brand / Series: Milwaukee MX4™ / SDS MAX 4-Cutter
• Product Type: SDS MAX 4-cutter masonry drill bit
• Diameter: 7/8"
• Usable Length: 12"
• Overall Length: 17"
• Head Material: Solid head carbide for up to 5X longer life in concrete with rebar
• Rebar Durability: Rebar guards for maximum durability in hard aggregate and rebar
• Starting Accuracy: Sharp centering tip for exact spot drilling in concrete and metal decking
• Rebar Performance: 4-cutter design helps prevent lock-up in rebar, reducing downtime
• Flute Design: Optimized flutes remove dust faster to reduce heat and deliver up to 15% more holes per battery charge
• Standard Compliance: Meets ANSI B212.15 to fit common anchors
• Wear Indication: Wear mark indicators show end of life and when the bit no longer meets ANSI requirements
• Tool Compatibility: Fits all SDS-MAX rotary hammers
• Recommended Use: Ideal for concrete with rebar and masonry
• Includes:
  • (1) SDS MAX 4CT MX4™ 7/8" x 12" x 17" Bit (48-20-3945)

Ideal For

• Drilling concrete with rebar where durability and reduced lock-up matter
• Masonry drilling in hard aggregate using rebar guards and a solid carbide head
• Accurate starts on concrete or metal decking using the sharp centering tip
• High-output work where faster dust removal helps reduce heat and improve efficiency
• Anchor installation requiring a bit that meets ANSI B212.15 sizing requirements