70mm Wood Lathe Chuck 2.75 Scroll Chuck 4-Jaw Self-Centering M18 X 2.5 1-Inch X 8TPI Woodworking Machine Tools Accessories -------- Removes Easy

External(Outside): 40-62mm Internal(Inside): 30-53mm. 1 Inch x 8 TPI M18 x 2.5mm Package contains:1 x Chuck body with round jaw set/1 x Woodworm screw/1 x T-handle hex wrench/1 x Gear key