【Size】Pack of 10PCS 3/16"*2，1/4"*4，5/16"*2，3/8"，1/2" (5*2+6*4+8*2+10+12MM) Carbide Tipped Masonry Drill Bits, Shank diameter: 1/4"(6.3MM) 【Precision Drilling】Crisscross Serrated Tip Design – Eliminates skidding and deviation common with traditional drill bits. Ensures exact hole positioning, especially on smooth surfaces like tiles & glass—no more frustrating re-drilling 【Universal Drilling】One Bit for All Jobs! Easily drills through wood, plastic, brick, masonry, tiles, and even glass/marble! Tungsten carbide tip + hardened steel body delivers powerful penetration, even in concrete (avoid rebar). Use with coolant for longer bit life 【High-Efficiency Chip Removal】Deepened Spiral Flute Design – 50% faster drilling with smooth debris ejection. Prevents clogging for cleaner, uninterrupted deep/hole drilling—saves time & effort 【Fits Most Drills】6.3mm Quick-fit Hex Shank – Compatible with all standard drills & bench drills. Extended bit length for hard-to-reach spaces. Best used with 2000-5000 RPM drills (24V+ cordless recommended for tough materials) This high-performance carbide drill has a cross-serrated tip with non-slip precision for effortless drilling into wood, plastics, bricks, tiles, glass and even concrete (avoid steel). The deep helical cutting edge ensures fast chip evacuation for smooth drilling and the 6.3 mm hexagonal shank fits most drills (recommended speed 2000-5000). The tungsten carbide tip and hardened steel body are built to last, making it the ultimate all-in-one drilling solution for DIYs and professionals!