This is a combination square, which can meet your various needs with only one ruler. The square ruler of protractor is made of high quality stainless steel, which is rust-proof, and . This woodworking workshop adopts bevel edge blade, roller knob and fine adjustment. Each mark is laser carved, so it is a laser carved scale. Suitable for measuring internal and external angles of parts. The length of ruler is 300mm. The measuring range is 0-180 degrees, and the accuracy is 5 feet /0.08 degrees. Name: Combined ruler Ruler Size: 300X25X2mm Colour:silver+black Material:Stainless steel Package Contents: 1 x Combined ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.