Made of high-quality brass, excellent workmanship and for use. 3 Sets Professional Small Drill Bit Collet Minn Twist Drill Chuck Set with 3 Different Clamping Size Copper Drill Clamping Size: 2.0mm, 2.35mm, 3.17mm perfect miniature drill chuck for combined use with a hand drill or electric drill, to drill ABS, wood board, paper, etc. Perfect tool accessory is compatible with most rotary tools, widely used in hardware, workshop, home, woodworking, etc. Colour: gold Material: copper Package Contents: 3 x 3 x Copper Cap 3 x Small Hex Wrench 3 x 0.5mm Drill Collet 3 x 1.0mm Drill Collet 3 x 1.5mm Drill Collet 3 x 2.5mm Drill Collet 3 x 3.0mm Drill Collet Only the above package content, other products are not included. Note: Light 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.