uxcell B18 Mounted 3-16mm Carpentry Electric Power Tool Key Type Drill Chuck Product Name : Key Type Drill Chuck;Fit For : Carpentry;Capacity : 3-16mm Mount : B18;Interior Hole Diameter : 16mm/ 0.63";Exterior Hole Diameter : Small: 40mm/ 1.6", Big: 50mm/ 2" Total Height : 9cm/ 3.5";Chuck Key : 85 x 45mm/ 3.3" x 1.8" (L*W) Main Material : Metal;Color : Black, Silver Tone Weight : 641g;Package Content : 1 x Drill Chuck,1 x Chuck Key