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. There are 104 serrated notches and 13 circular holes, The spacing of the serrations is 11/112inch (approximately equal to 2.49 mm) and that of the round holes is 1inch. name:Woodworkers Edge Ruler Protractor Applicable people:Architect//Decorator/ Usage scenario:Carpenter,Woodworking Application:Measuring Set Reading way: Metric , Inches Specification:45cm Colour:As Shown Material:Stainless steel + plastic Package Contents: 1 x Woodworkers Edge Ruler Protractor 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.