Pin vise are basically working with small objects. This is made of stainless steel with black coated on jaw to work precision metals. It does not scratch the product and securely hold it. It is about 10 cm long work on bench vise effectively. this tool is used to hold small tools or to support items being worked upon. The sprung jaws are opened and closed by rotating a nut on a thread clockwise or anticlockwise. Perfect bench tools for beginners.