PCB mini drills: PCB mini drills are made of carbide, the shank diameter is . 3.175 mm, overall length is . 38 mm, which fit for processing PCB, normal FR-4, -3 boards, SMT, CNC, molds, plastic, circuit board, carbon fiber, composite board and so on What you receive: this hand drill bits set for your craft carving DIY work Hand Drill with Drill Bits Jewelry Drill, Resin Drill, Mini Drill, Hand Drill for Jewelry Making, Pin Vise Hand Drill, Hand Drill for Resin, Micro-Drill Bit, Mini Drill Set Pin vise hand drill: made of high-quality material, 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 Micro-twist drill bits: Micro-drill bits are light in weight and compact in size, 't take up extra spaces, tools to be applied for handling wood, plastic, rubber, PVC, walnut, model, bone, angle, amber, olive, fiberglass and other materials, Weight: 0.25794084654 Pounds, Manufacturer: Transail