The brass collet set includes 8 sizes of 4 claw brass collets to choose from. Diameter: 0.8mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.4mm, 3.0mm, 3.2mm. They're compatible with most rotary tools. The brass collet solves the blind zone of the clamping path. The 4 claw brass collet holds tiny bits firmly even under high-speed rotation. The 3-jaw keyless chuck holds accessory rotary bits with 1/32inch to 1/8inch shanks. It is compatible with both cordless and corded rotary tools like drill bits, sanding drums, polishing wheels, etc. Compared to those soft and easy-to-bend metal or aluminum alloys, our collets are made of brass material, more sturdy and resilient. You don' have to worry they break during use. You get 8pcs brass collets in 8 sizes 0.8mm-3.2mm, 2pcs metal change collet nuts, and 2pcs 1/32inch to 1/8inch quick change keyless chuck in a package. Colour:Gold Material:Metal Package Contents: 1 * brass collet set 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.