SDS Plus 4CT MX4™ 3/16" X 4" X 6" Bulk 100

The Milwaukee 48-20-7990 SDS PLUS 4CT MX4™ 3/16" x 4" x 6" Bulk (100) is a high-production contractor pack of premium masonry drill bits engineered for fast, consistent drilling in concrete, brick, block, and reinforced concrete with rebar.

Each bit features Milwaukee’s MX4™ 4-cutter solid carbide head, designed for maximum durability and efficiency in hard aggregate. The four-cutter geometry improves hole accuracy, reduces walking, and significantly increases resistance when encountering rebar compared to standard 2-cutter bits, making it ideal for repetitive anchor drilling.

A breaker-point tip aggressively fractures concrete for faster penetration, while reinforced flutes efficiently evacuate dust and debris to reduce heat buildup and maintain consistent drilling performance over long production runs. The design also helps extend tool life and improve drilling efficiency in cordless and corded rotary hammers.

The 3/16-inch diameter is commonly used for light-duty anchoring applications such as Tapcon-style fasteners, and the 4-inch working depth (6-inch overall length) provides controlled drilling for standard installation work. The bulk 100-pack format is intended for large contractors, industrial users, and high-volume jobsite applications.

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
• Centering tip for accurate hole placement
• SDS-Plus shank compatible with all SDS-Plus rotary hammers
• Bulk 100-pack for high-production drilling environments

Ideal Applications:

• Installing concrete anchors and Tapcon fasteners
• Electrical, plumbing, and mechanical installations
• Drilling into brick, block, and poured concrete
• Large-scale commercial and industrial construction work