170 pce HSS drill bit set made to DIN standards. Contains 10 of sizes: 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8mm & 5 of sizes: 8.5, 9, 9.5, 10mm. HSS drill bits are suitable for general and workshop use on metal, plastic and wood.