The Spiral Drill Set is an HSS twist drill bit DIN 338, type N. The set comes in a metal case. The drills are right-cutting. Specifications: Color: silver Material: metal Weight: 3.27 kg Point angle: 118° Contents: 10x Spiral drills - size 1-8 mm (increasing per 0.5 mm) 5x Spiral drills - size 8.5-10 mm (increasing by 0.5 mm)