MULTI-FUNCTION: MUSIBO woodworking protractors ruler is a multifunctional device for length measurement and angle drawing. It can measure lengths and draw parallel lines at different angles and intervals easily, which will bring much convenience to your work. Each woodworking ruler is equipped with a wall-mounted storage rack, which make it easy to store. MUSIBO woodworking protractors ruler is an indispensable tool for every woodworkers and mechanicsHIGH PRECISION: The ruler tool can be adjusted from 0 to 70, every 5 (plus 22-1/ 2, 67-1/ 2) has a steel ball to lock the angle firmly during the painting lines; Any angle can be obtained by moving and rotating the ruler. The ruler has a total length of 13in, and the smallest scale is accurate to 1/32in. There are 104 serrated notches and 13 circular holes, The spacing of the serrations is 11/112in (approximately equal to 2.49 mm) and that of the round holes is 1in