Specifications: 1) Diameter: a) 4mm (5/32") b) 4.5mm (1/8") c) 6.4mm (17/64") d) 7.6mm (19/64") e) 11mm (7/16") f) 16mm (5/8") g) 19mm (3/4") h) 24mm (15/16") 2) Application: for extracting broken screws in wood 3) Material: 45# carbon steel Packing: Double blister, plastic box, skin card, blow case, or others