- 【Multi- Size Specifications】: The concrete drill bit set includes 1 pieces 3 cm ( 1. 18 inch ), 1 pieces 4 cm ( 1. 57 inch ), 1 pieces 5 cm ( 1. 96 inch ), 1 pieces 6cm ( 2. 36 inch ), 1 pieces 8cm ( 3. 14 inch ), 1 pieces 10 cm ( 3. 93 inch ), 1 pieces 12 cm ( 4. 72 inch ), a total 7 pieces in one pack to meet your needs.- 【Premium and Durable】: Triangle masonry drill bit set with high hardness and pointed drilling, which is made of a premium alloy, not easy to damage or, durable to use.- 【Widely Application】: The ultimate drill bits can match with the electric drill and bench drill. Suitable for stainless steel, iron, glass, brick wall, wood, ceramic tiles, plastic, concrete, cement and so on. Package Including 7pcs X Ultimate Triangle Drill Bits