Clamping parts (for hand tightening) are the parts that make up a clamp used to secure materials such as wood, stone, etc. to the work bench. They can be freely combined and used for various purposes such as auxiliary tightening (temporary pressing), fixing of guide parts, etc. as well as final tightening. Processing becomes easier by fixing the material firmly using clamping parts. Metals such as steel are used as materials to apply pressure to the material. Clamping parts (for hand tightening) include jacks for lifting heavy objects with low force, toggle clamps for fixing materials using a toggle mechanism, nuts for tightening bolts and screws, attachments with different shapes and surface roughness, etc. Jacks are often screw jacks, which move heavy objects and determine their position by rotating.