These high speed steel (HSS) bits are threaded for metric thread tapping of soft metal, wood, plastic, aluminum, and iron. They are multi-coated to remain bright and sharp.Specifications:Materials: High-speed steel (HSS)Shank diameter: ¼ inch (6.35 mm) hexSize & quantity:1 x M3 x 0.5 (6-32NC) total length: 55 mm; Spiral length: 24 mm; drill diameter: 2.5 mm1 pcs M4 x 0.7 (8-32NC) total length: 54 mm; Spiral length: 24 mm; drill diameter: 3.3 mm1 pcs M5 x 0.8 (10-32NC) total length: 58 mm; Spiral length: 28 mm; drill diameter: 4.2 mm1 pcs M6 x 1.0 (10-24NC) total length: 58 mm; Spiral length: 28 mm; drill diameter: 5.0 mm1 pcs M8 x 1.25 (12-24NC) total length: 59 mm; Spiral length: 18 mm; drill diameter: 6.8 mm1 pcs M10 x 1.5 (1 / 4-20NC) total length: 59 mm; Spiral length: 20 mm; drill diameter: 8.5 mmPackaging Details:Weight: 0.3kg (0.66lb.)Package Size: 20cm x 20cm x 15cm (7.87in x 7.87in x 5.91in)Package Includes:1 x 6-piece set of composite drill and tap bits