Strong brass material: Compared with those soft and easy to bend metal or aluminum alloy, our brass chuck is made of high-quality brass material, which is more solid and elastic. You don't have to worry about them 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-jaw brass chuck can firmly clamp the tiny drill bit. 8 sizes of brass collets: The brass collet set includes 8 sizes of 4-jaw 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. Please confirm the size you need before purchasing. Three jaw keyless chuck: The three jaw keyless chuck holds the auxiliary rotary 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 rotary 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.