Utoolmart Brass Drill Chuck Collet Bits Technical Parameters Material: Brass Collet Size: 1.6mm/0.06" Clamping Range: 1.3-1.7mm Collet Shank Diameter: 4.8mm/0.19" Product Feature 1.Made of pure copper material, specially heat-treated, high hardness and durability. 2.Compatible with most rotary tools such as hardware, hobbies, homes, etc.; suitable for installing drills, electric grinders, hanging mills, hoses, etc. 3.Change the clamping capacity of the electric grinder and solve the blind zone of the clamping path. 4.Ideal for combined use with a hand drill or electric drill,to drill ABS,wood board,presspaper,etc. Package Content 5 x Drill Collets Bits