Quick change keyless chucks hold accessories with 1/32 inch to 1/8 inch shank sizes. One-piece structure design, alloy material, sturdy and durable, more durable than plastic models. The 3-jaw chuck is well-made, and the built-in spring is stable and durable. There are eight sizes of brass collets included: 0.8mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.4mm, 3.0mm, 3.2mm. Compatible with all rotary tools and flex shafts. 3-jaw chuck compatible with all cordless and corded rotary tools, including drill bits, sanding drums, polishing wheels, and other light-duty accessories. Color: Gold + Black Material: Brass Package Contents: 1 set x Drill Chuck Collet Set Only the above package content is included; other products are not included. Note: Light and display differences may cause slight variations in the color of the item compared to the picture. Measurement may vary by +/- 1-3 cm.