Unique patented locking function, breaking the traditional locking methods. After having ratchet, the locking pieces mounted on the rear sleeve, the locking peripheral length, more effective in preventing the removal work loose, the collet is more reliable when the gripping means. Good metal texture, comfortable coat surface. Torque thrust bearing unique easy-grip exerted translate into greater clamping force. Scope: Suitable for power 1050W more impact drill. Specifications: Clamping range: 0.8-10mm/0.031 inch-0.39 inch Mount: 3/8-24UNF Socket Connecting rod: 1/2 inch Square Socket Adaptor Tips: The product may be updated constantly, The Actual Product May Have Slight Differences Or Color Differences the color and appearance may be changed, please don't mind. And take a consideration before place the order if you have request for color or appearance. color: Black material: metal Package Contents: 1 x Drill Chuck 1 x Socket Adapter Only the above package content, other products are not included. Note: Light reflection 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.