This angle locking clamp is high strength engineering plastics, the although lightweight, is for tough and and corrosion-resistant for long term use. Buy in confidence The two sides have measurements on in centimeters and the other in inches The is so easy compared to those that you have to screw tight. All you have to do is flipping the up or down. Cannot be easier. This woodworking corner jig is an for ideal for novice or professionals Accuracy 90 degree allows you to and pin the frames precisely and quickly a wide variety of wood sizes, the clamping range is about 3.82inches, Manufacturer: XIAOQENAN