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Attention: 1, If the concrete drill bit drills into the steel bar, then needs to be re-drilled, or drill bit might be damaged. 2, These concrete drill bits should not be used as a chisel, or it will be easily damaged. Features: Made of high quality tungsten cobalt, carbide-tipped (YG8) bit heads are harder, it provide longevity and will stay sharper much longer, also, with heat treatment, masonry drill bits set are very strong and durable, excellent rust resistance. Two Flute, ensure fast and efficiently remove drilling dust and debris. Rock carbide tip maximizes carbide surface contact for longer bit life.The spiral shank increase cutting speed and prevents slipping. Widely used in construction, installation and other industries, It is a highly efficient professional drill. These masonry drill bits featured round shank, can compatible with all SDS Plus sized rotary hammer drills. It widely used for brick, block, masonry, concrete, ceramic tile, cement and for Low To Medium Hardness Stone, Rock. Concrete bit optimized design allows material to quickly move out the hole while protect the drill bits Specification: Material: Tungsten cobalt, Carbide-tipped (YG8) Size: 2pcs 6/25" * 4-1/3", 2pcs 6/25" * 5-9/10", 1pcs 6/25" * 7-9/10", 2pcs 3/10" * 4-1/3", 2pcs 3/10" * 5-9/10", 1pcs 3/10" * 7-9/10", 2pcs 2/5" * 5-9/10", 1pcs 2/5" * 7-9/10", 1pcs 1/2" * 5-9/10", 1pcs 1/2" * 7-9/10", 1pcs 11/20" * 5-9/10", 1pcs 11/20" * 7-9/10", 1pcs 3/5" * 5-9/10", 1pcs 3/5" * 7-9/10", 1pcs 7/10" * 7-9/10" Weight: 1.4kg Package Included: 20pcs concrete drill bits, size from 6/25" * 4-1/3" to 7/10" * 7-9/10"