ITEM NAME:10pcs/Set Mini Drill Brass Collet Chuck for Rotary Tool 0.5-3.2mm Usef FLY Descriptio n Description: Name: Supply mini electric grinder micro electric drill rough number copper chuck set Dimensions: rod diameter 2.35mm, tail clamping diameter 4.3mm, spindle inner diameter 4.4mm, length 17mm Color: gold Material: copper 1. Four-petal spring: It adopts the scientific four-petal spring design, which is clamped and fastened, safe and secure. 2. Pure copper sandwich, full metal clamping nut: Made of pure copper material, the whole is specially heat treated, with higher hardness and durability. 3. Full metal clamping nut. Product Includes: 10pcs (0.5, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, 2.4, 3.0, 3.2mm each) Note: 1.Please allow a little size error due to manual measurement. 2.Please be reminded that due to lighting effects and monitor's brightness/contrast settings etc, the color tone of the website's photo and the actual item could be slightly different. We offer you what you need! copper chuck set 10pcs.Copper chuck set 10pcs. 10pcs (0.5, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, 2.4, 3.0, 3.2mm each). We'd like to settle any problem in a friendly manner. Four-petal spring: It adopts the scientific four-petal spring design, which is clamped and fastened, safe and secure.