Key features25 piece metal drill bit set hss g din 338 135 in metal cassette specifications1 13 mm 135technical specifications diameter mm 10 diameter mm 15 diameter mm 20 diameter mm 25 diameter mm 30 diameter mm 35 diameter mm 40 diameter mm 45 diameter mm 50 diameter mm 55 diameter mm 60 diameter mm 65 diameter mm 70 diameter mm 75 dia