8 SIZES BRASS COLLETS: 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. Please confirm the size you need before purchasing. STURDY BRASS MATERIAL: Compared to those soft and easy-to-bend metal or aluminum alloys, our brass collets are made of high-quality brass material, more sturdy and resilient. You don't have to worry they break during use. HIGHT PRECISION & HOLDS FIRMLY: The brass collet solves the blind zone of the clamping path. The 4 claws' brass collet holds tiny bits firmly even under high-speed rotation. 3-JAW KEYLESS CHUCK: The 3-jaw keyless chuck holds accessory rotary bits with 1/32 inch to 1/8 inch shanks. The alloy material makes it more sturdy and than plastic . It is compatible with both cordless and corded rotary tools like drill bits, sanding drums, polishing wheels, etc. WHAT YOU GET: 8pcs brass 4485 collets in 8 sizes 0.8mm-3.2mm, 1pcs metal change collet nuts, and 1pcs 1/32 inch to 1/8 inch quick change keyless chucks. Material: Brass Color as shown Package Contents: 8 x Brass Collet 1 x nut 1 x 3-jaw chuck 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.