Round Head - Makes it possible to anchor the protractor against objects to hold it in place as you take measurements. Measures - Deeply etched graduations read from 0 to 180 in forward and reverse directions and will not wear or rub off. Adjustable - Adjustable protractor arm locks into desired position with knurled thumb nut to quickly and easily identify angles. Durable - Stainless steel for precision, strength and rust resistance. Perfect For - Students, machinists, carpenters and woodworking hobbyists for setting bevels, measuring and transferring angles. Features: Ruler made of stainless steel. Screw nut fix the ruler. 0-180 Surface useg laser engraving easy read , durable and precise angle measurement. Adjustable screw design, the need for a fixed reading, the screw can be tightened. Thickened body resistance to bending, not easily deformed. Stainless steel ruler edge have been polished smooth to protect hand use. Widely used in industrial, business units. Model: Adjustable Angle Ruler Material: SS Size: 250 x 300mm Length: 367mm Width: 52mm Disc Height: 1.4mm Thickness: 2.8mm Product Weight : 4.94 Ounces Product Dimensions (L*W*H) :14.45*2.05*0.59 Inches Package Include: 1 x Stainless Steel Angle Ruler