Swansons 9" Sliding T-Bevel has been designed primarily for the most discriminating woodworkers. Thesliding T-bevel is used to transfer angles &as a depth gauge in many construction &woodworking jobs. The brass binding on the hardwood on this model eliminates twisting.The bladeis made of stainless steel & can be securely fixed in place with the brass knurled knob. A great & handy tool for angle layouts & measurements.