How to use pin vise: Step 1: take out the suitable drill bit, and half unscrew the vise head. : half insert the drill bit, and screw the head tightly. Step 3: target the place where you are going to d more→rill a hole, use one hand to fix the top of handle while using the other hand to rotate the handle. Size: 0.3-1.2mm The diameter is . 3.175 mm, overall length is . 38 mm, which fit for processing PCB, normal FR-4, -3 boards, SMT, CNC, , plastic, circuit board, carbon fiber, composite board and so on Size: 3 Pieces of 0.5,0.6,0.7,0.8,0.9,1.0mm size, total 18 piece; 2 pieces of 1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9,2.0mm size, a total of 20 pieces; 1 piece of 2.1,2.2,2.3,2.4,2.5,2.6,2.7,2.8,2.9,3.0mm …