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 ' 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 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.