ITEM NAME:Hot Electric Drill Grinding Mini Drill Chuck Key Keyless Drill Chucks 0.3-4 C5B1 Hot Electric Drill Grinding Mini Drill Chuck Key Keyless Drill Chucks 0.3-4 C5B1 High precision screw thread and tapered hole. Strong impact resistance. Compatible with impact dril and different power electric drill. JT0 taper the biggest end of diameter: 6.350mm JT0 taper The smallest end of diameter: 5.800mm Outer diameter: 21.5mm Taper: 2 degrees 49 minutes 24.7 seconds Work with 0.3mm-4mm( 0.01 inch - 0.16 inch) Drill,The maximum clamping 4.2mm. Connection size: JT0 (inner hole diameter is 6 mm) color: Silver Material: Chrome vanadium steel Package list: 1 x Drill Chuck 1 x T spanner 1 x L spanner 1 x 3.17mm connector note: Does not include motor Only the above package content, other products are not included. Note: Light shooting 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..1 x Drill Chuck. Compatible with impact dril and different power electric drill. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.