About this item 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 DIY work Pin vise hand drill: made of aluminum alloy, this pin vise hand drill is durable and firm, adopting 3 claws chuck and 0.3 - 3.4 mm range of adjustable clamp, its tail can be rotated, sturdy and convenient for you to operate Mini drills: mini drills are made of tungsten carbide, the shank diameter is approx. 3.175 mm, overall length is approx. 38 mm, which fit for normal FR-4, CEM-3 boards, CNC, molds, plastic, circuit board, carbon fiber, composite board and so on Micro twist drill bits: micro drill bits are light in weight and compact in size, won'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