Top Material: Metal drill body, high-strength Metal drill bit. They're tough, long-lasting, and to wear. You can use this pin vise and drill bit set for all your DIY hobbies without worrying about breaking. For mini Drills: This pin vise handle is made to hold tiny twist drill bits securely, with a clamping range of 0.3mm (.0135inch) - 1mm (.0390inch). It grips tightly and 't slip for high precision. Small & Precise: These micro-drills are tiny and perfect for drilling small, precise holes. They provide clean, smooth cuts. Pin Vise: 115mm x 10mm. Drill Bits are numbered 61-80. These different sizes suit various DIY projects. Please check the size before buying Size Detail: 61(.0390inch) 62(.0380inch) 63(.0370inch) 64(.0.0360inch) 65(.0350inch) 66(.0330inch) 67(.0320inch) 68(.0.0310) 69(.0292inch) 70(.0280inch) 71(.0260inch) 72(.0250inch) 73(.0240inch) 74(.0225inch) 75(.0210inch) 76(.0200inch) 77(.0180inch) 78(.0160inch) 79(.0145inch) 80(.0135inch) Colour:As Shown Material:Metal Package Contents: 20 x Drill Bits 1 x Needle Vise 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.