Specifications:Very durable, convenient to use.Suitable for drill, screwdriver, batch head and other to transfer.Fast fastening, greatly improve work efficiency.The rotation is smooth and without phase grinding, accuracy is good.Type: Drill BitMaterial: Metal, CarbideCutting Capacity: No Power SpindleNo-load Speed: 10000RPMConnecting Rod Diameter: 10mm/0.4" (Approx.)Features: Durable, Easy to Use, No Powered SpindleSize (Length x Handle Diameter):JTO: 106mm x 10mm/4.2 x 0.4" (Approx.)B10: 112mm x 10mm/4.4 x 0.4" (Approx.)B12: 114mm x 10mm/4.5 x 0.4" (Approx.)B16: 120mm x 10mm/4.7 x 0.4" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Drill Bit