Indispensable tools for woodworking: It can be used as a cutting knife adapter, suitable for a variety of cutting knives, meeting the needs of woodworking. 3 Models: The set contains a total of 6 pieces of chucks, which are divided into three sizes: 6mm, 6.35mm and 8mm, 2 pieces for each size. Rich models 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 should only be cleaned with gasoline or cleaning agent before installation, it is especially easy to operate. Wide Uses: Tool clamp adapter suitable for engraving machines, wood milling machines, cutting engraving machines, etc. 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. 2.Portable, high precision, tight and stable clamping, improve work efficiency. 3.Suitable for engraving machine, wood router. perfect woodworking tool. Specification Material: steel Color: silver black < p>Card head size: 8mm, 6.35mm, 6mm Package includes 6x clamp adapter< /p> Note 1.For manual measurement, please allow 1mm error. 2.Color may vary slightly due to lights, screens etc.