Wide Application: The brass drill chuck is mainly used to replace different size drill bits on the hand grinder. High Quality Material: Our collets are made of high quality brass, which has high hardness and is not easy to break. Therefore, they are more durable than aluminum. In addition, we have nickel-plated the nuts to make them less prone to rusting and to increase the life of the nuts. Drill Chuck: Quick-change drill chuck for a of attachments from 1/32 to 1/8 sizes. Be to measure and compare sizes purchasing. Drill Chucks: Drill chucks are suitable for all cordless and corded tools (including drills, grinding wheels, buffing wheels and other light-weight accessories). This keyless drill chuck offers a huge increase in precision, holding those small bits more securely and accommodating the rotation of the tool better. Dear Assortment: The set includes 0.8mm, 1.2mm, 1mm, 1.5mm, 1.8mm, 2mm, 2.4mm, 3mm, 3.2mm diameter collets with lock nuts and drill chucks. Colour:As Shown Material:brass Size:2.24 x 0.94cm Package Contents: 2 x M8 silver nut 2 x M8 collet 16 x copper collet 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.