Specifications: Ideal for combined use with a hand drill or electric drill. It is used to drill ABS, wood board and other woodwork. It is made of brass, sturdy build, and ensures durable use. Item Name: Drill Collet Set Material: Brass Style: 1#: 2.35mm Drill Collet Set 2#: 3.17mm Drill Collet Set 3#: 2mm Drill Collet Set 4#: 4.05mm Drill Collet Set 5#: 5.05mm Drill Collet Set Quantity: 7Pcs (1 Copper Drill Clamp, 5 Copper Collets, 1 Small Wrench) Features: Sturdy Build, Extra Durable Use, Simple Operation Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Drill Collet Set (7Pcs)