17pc Combination Drill Bit Set Manufactured with HSS twist drills and carbon steel masonry drill bits. 12pc Titanium coated HSS straight shank twist drills 1.5, 2.0, 2.5, 3.0, 3.2, 3.5, 4.0, 4.5, 4.8, 5.0, 5.5, 6.0mm. 5pc masonry drill bits 3.0, 5.0, 6.0, 8.0, 10mmFeatures:Manufactured with HSS twist drills and carbon steel masonry drill bits.12pc Titanium coated HSS straight shank twist drills - 1.5, 2.0, 2.5, 3.0, 3.2, 3.5, 4.0, 4.5, 4.8, 5.0, 5.5, 6.0mm.5pc masonry drill bits - 3.0, 5.0, 6.0, 8.0, 10mm