aluminum alloy & brass, wear resistant, not easy to rust, not easy to break and deform, and has a longer service life This product adopts ergonomic design and is very to use.Copper positioning block can be moved to the desired position and then used by tightening the screws.It is not easy to slide and is suitable for all kinds of steel rulers This product is small in size and light in weight, which is very to carry around Woodworking positioning block steel ruler is suitable for woodworkers and home users, and has a wide range of uses Suitable for all kinds of rulers, and not easy to fall You can easily draw parallel lines with this tool, for ideal for engineers, craftsmen, model makers, Manufacturer: HVRFJXI