SDS Plus Drill Bit: Fit for all drills with SDS-Plus holders, matching with electric hammer perfectly. Shank Size: 6mm (3/16 inch), 8mm (1/4 inch), 10mm (5/16 inch), 12mm (3/8 inch), 14mm (7/16 inch), 16mm (1/2 inch), 1pc for each size. High Hardness: High quality heat resistant high-speed steel shank and YG8C alloy drill bit to ensure high strength, abrasion resistance and durability. Double Fluted Design: Provide optimum removal of dust and debris via rounded spiral geometry, for high working efficiency. Application: For drilling holes in concrete, brick, stone, wood, metal, aluminum, plastic, and multi-layer materials.