Specification:Pin Vise Hand Drill:Material: alloyColor: blackSize: 3.74 inches/ 9.5 cm long How to use pin vise:Step 1: take out the suitable drill bit, and half unscrew the vise head.Step 2: half insert the drill bit, and screw the head tightly.Step 3: target the place where you are going to drill a hole, use one hand to fix the top of handle while using the other hand to rotate the handle. 48 Piece Twist drill bit:Material: steelColor: SilverSize: 3 Pieces of 0.50.60.70.80.91.0mm size, total 18 piece; 2 pieces of 1.11.21.31.41.51.61.71.81.92.0mm size, a total of 20 pieces; 1 piece of 2.12.22.32.42.52.62.72.82.93.0mm size, a total of 10 pieces10 Pieces PCB Mini Drill Bits:Material: Tungsten steelColor: color send randomSize: 0.3-1.2mm The shank diameter is approx. 3.175 mm, overall length is approx. 38 mm, which fit for processing PCB, normal FR-4, CEM-3 boards, SMT, CNC, molds, plastic, circuit board, carbon fiber, composite board and so on Package include:1 x Pin vise48 x Twist Drill bits10 x PCB Mini Drill Bits Warm Tips:Not suitable for hard materials like iron, steel, stone, glass, tile, etc..The pin vise is manual, not electronic.Small hand drill, only can clamp the drill bits of under 3 mm.Manual measurement, please allow slight difference.