SDS Plus 4CT MX4™ 1/4" X 4" X 6" Bulk 15

The Milwaukee 48-20-7911 SDS PLUS 4CT MX4™ 1/4" x 4" x 6" Bulk (15) is a contractor-grade masonry drill bit set designed for fast, precise, and durable drilling in concrete, brick, block, and reinforced concrete with rebar.

Each bit uses Milwaukee’s MX4™ 4-cutter solid carbide head, engineered for maximum durability and consistent performance in hard aggregate. The four-cutter design improves hole accuracy, reduces walking, and significantly improves resistance when striking rebar compared to standard 2-cutter bits.

A breaker-point tip aggressively fractures concrete for faster drilling speed, while reinforced flutes efficiently remove dust and debris to reduce heat buildup and extend tool life. The design also helps maintain stability and consistent performance in repetitive drilling applications.

The 1/4-inch diameter is commonly used for light-duty anchor installations such as Tapcon-style fasteners, and the 4-inch working depth (6-inch overall length) provides controlled drilling for standard installation tasks. The bulk 15-pack format is ideal for contractors and jobsite productivity where repeated drilling is required.

Key Features:

• MX4™ 4-cutter carbide head for high durability in rebar
• Breaker-point tip for fast, aggressive drilling
• Reinforced flutes for improved debris removal and reduced vibration
• SDS-Plus shank compatible with all SDS-Plus rotary hammers
• Bulk 15-pack for contractor efficiency and productivity
• Designed for concrete, brick, and reinforced masonry

Ideal Applications:

• Installing concrete anchors and Tapcon fasteners
• Electrical, plumbing, and mechanical installation work
• Drilling through light-to-moderate rebar in concrete
• High-volume construction and renovation tasks