What you receive: this hand drill bits set includes 1 piece of pin vise hand drill, 46 pieces of micro twist drill bits and 10 pieces of PCB mini drill bits, total 57 pieces for your craft carving work Pin vise hand drill: made of aluminum alloy, this pin vise hand drill is and firm, adopting 3 claws chuck and 0.3 - 3.4 mm range of adjustable clamp, its tail can be rotated, sturdy and convenient to operate Mini drills: mini drills are made of tungsten carbide, the shank diameter is . 3.175 mm, overall length is . 38 mm, which fit for normal FR-4, -3 boards, CNC, molds, plastic, circuit board, carbon fiber, composite board and so on Micro twist drill bits: Drill bits are light in weight and compact in size, 't take up extra spaces, nice tools to be applied for handling wood, plastic, rubber, PVC, walnut, model, bone, angle, amber, olive, fiberglass and other materials Practical and portable: manual hand drill set is easy to carry or store in a toolbox or in pocket, making your daily work more convenient, which are suitable for electronic assembling, tooling, model making, winding, home decorating and so on Color: Blue Material: Metal Package Contents: 1* hand drill bits set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.