practical 0.7-3 mm hand twist boor sliding drilling metal spiral tool with boor

material: metal color: when the p show take four, both ends of the clamped head can be replaced. suitable for clamped head, screwdriver, drill and other small tools. perfect for building drawings and renderings. the part of took four head steel is clamped small parts. suitable: ivory horn amber olive wood walnut model plastic and other drills. hand boor size: length: 9.5cm/3.74 "d iameter:0.9cm/0.35 " the clamped diameter: 0.7-3mm/0.028 "-0.118" tips: the hand twist drill is not suit