Usage Tips: 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 will 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 ones. 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.