Essential tools for woodworking: They can be used as an adapter for cutting knives, suitable for a variety of cutting knives and meeting the needs of woodworking. 3 models: The set contains a total of 6 pieces of collet chucks, which are divided into three sizes: 6mm, 6.35mm and 8mm, 2 pieces for each size. Rich patterns can meet your different needs. Good quality: The chuck is made of high quality carbon steel with high hardness and high wear resistance. It is not easy to corrode and can be used continuously for a long time. Easy to use: The chuck only needs to be cleaned with gasoline or cleaning agent before installation, it is particularly easy to use. Wide uses: Tool collet adapter suitable for engraving machines, wood milling machines, cutting engraving machines, etc. Description 1. When loading the knife, clean the chuck and pressure cap with detergent (gasoline is also allowed). Make sure tools are clean and free of debris before installing them. 2.Portable, high precision, tight and stable clamping, improve work efficiency. 3.Suitable for engraving machine, woodworking router. Perfect woodworking tool. Specification Material: steel Color: silver black Card head size: 8mm, 6.35mm, 6mm Package Includes 6x Clamp Adapter Note 1.For manual measurement, please allow 1mm error. 2.Color may vary slightly due to lights, screens, etc. Delivered quantity: 6 pieces Product color: black Product size: 6mm, 6.35mm, 8mm Note: Manual measurement, please allow 1-3cm error.