Specifications: High speed steel. 20 pcs twist drill bit set. Repair tools. With black cover case. Type: Drill Bit Set Quantity: 20 Pcs Material: HSS 4241 + Plastic Case Drill Bit Color: Silver Case Color: Black Usage: for Carpentry, Family Standing, Electronic Repairs, Drill Wood Products, Plastics, Circuit Boards, etc. Not to be used for metal drilling. Size: 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Twist Drill Bit Set(20 Pcs) 1 x Plastic Case