5pc Premium Percussion Masonry Drill Bit Set 5/16"x6" SUITABLE FOR: Drilling holes into concrete, brick, stones, blocks, mortar, cement, and more. Drill through tough materials for home repairs, home building, and personal projects. SLIP REDUCTION: The shank on each bit has three (3) flat sides to eliminate slipping. 5/16" tip, 6" overall length. DURABILITY: These multi-material drill bits have carbide tips for added durability and longer use. US-BASED CUSTOMER SERVICE: Available by chat, email, phone, or visit us at our customer service center in La Crosse, WI.