Strong brass material: Compared with those soft and easy to bend metal or aluminum alloy, brass chuck is made of high-quality brass material, which is more solid and elastic. You 't have to worry about breaking during use. High precision and stability: The brass chuck solves the blind area of the clamping path. Even in the case of high-speed rotation, the 4- brass chuck can firmly clamp the drill bit. 8 sizes of brass collets: The brass collet set includes 8 sizes of 4- brass collets for . Diameter: 0.8mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.4mm, 3.0mm, 3.2mm. They are compatible with most rotation tools. confirm the size you need purchasing. Three keyless chuck: The three keyless chuck holds the auxiliary drill bit with a 1/32inch to 1/8inch handle. The alloy material makes it stronger and than the plastic material. It is compatible with cordless and wired tools, such as drill, sanding drum, polishing wheel, etc. Colour:as shown Material:brass Package Contents: 8 x brass 4485 chucks with dimensions of 0.8mm-3.2mm 1 x metal replacement chuck nut, 1 x 1/32inch to 1/8inch quick replacement keyless 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.