Feature:1. With Various Sizes: The kit contains a hand drill handle and 20pcs mini twist drill bits, with various sizes and a wide range of applications.2. Durable Materials: These hand twist drill tools are made of high speed steel and aluminum alloy, which are resistant to high temperatures and durable.3. Compact Bits: These twist drills are small and compact, suitable for drilling in small spaces, and have strong practicability.4. Multiple Usages: Suitable for use in jewelry making, electronic assembly, or drilling holes in soft metals, plastics, wood, etc.5. With Storage Box: Comes with a storage box for easy storage and organization of these hand twist drill tools, and easy to carry.Specification:Item Type: Hand Twist Drill SetMaterial: High speed steel, aluminum alloyHand Twist Drill Shank Diameter: Approx. 10mm / 0.4inHand Twist Drill Length: Approx. 114mm / 4.5inHand Twist Drill Clamping: 0.3-1mm20Pcs Twist Drill Bits Size: #61(0.0390in), #62(0.0380in), #63(0.0370in), #64(0.0360in), #65(0.0350in)#66(0.0330in), #67(0.0320in), #68(0.0310in), #69(0.0292in), #70(0.0280in)#71(0.0260in), #72(0.0250in), #73(0.0240in), #74(0.0225in), #75(0.0210in)#76(0.0200in), #77(0.0180in), #78(0.0160in), #79(0.0145in), #80(0.0135in).Package List:20 x Twist Drill Bits1 x Hand Twist Drill Handle1 x Plastic BoxNote:1. The items are small, please keep them properly.2. The parameters have little error.