Exact Drill Bits & Parts Twist drill bit 620958 - Exact 74840, The Exact 74840 HSS TIN-TIP Twist drill bit, measuring 4 mm and conforming to DIN 338, is a precision steel drill bit featuring a titanium nitride tip for enhanced durability. Ideal for machining and drilling through metal, sheet metal, and other tough materials, it is available in a set of 10. This twist drill bit is a reliable tool for professional and industrial applications. Exact 74840 Twist Drill Bit 4mm DIN 338 Pack of 10 HSS TIN-TIP