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10 Pcs Drill Bits Set with Strength Carbide Tips make it easier to drill holes in ceramic tile, marble, mirror and brick wall concrete.Metal alloyed glass drill bits with carbide tip stand up to the toughest daily use.Low speed drilling will protect the ceramic, porcelain, marble and avoid breakage. The bits are made of premium metal alloy and coated with zinc, so they are rust-proof and corrosion-resistant, and the strength carbide tip provides durable and wear-resistant masonry drill bits for concrete work. Specification: Material: YG8 tungsten steel alloy Package List: 10 pieces of drill bits coming with all popular sizes – 1/8” (1 INCLUDED), 5/32” (1 INCLUDED), 3/16” (1 INCLUDED), 1/4” (4 INCLUDED), 5/16” (1 INCLUDED), 3/8” (1 INCLUDED), 1/2” (1 INCLUDED) 1 Convenient carrying case. Note: - This drill bit set is not for hammer drill. - If you want to drill glass, porcelain floor tile, marble or granite, please lubricate them with water.