Multi-angle measurement: The 2 removable arms used to measure angles from 85 to 180 can be used directly to measure all angles in this range. Error-free: the bottom plate is placed on the guide plate provided by means of the saw's built-in guide pin and sawn with a back saw to achieve an accurate, error-free diagonal cut. Step to solve: you can measure the miter angle and complete the cut without using multiple tools and avoid errors when transferring another tool. Strong Compatibility: This tool is used to solve baseboard or groove problems that require measuring tools specials for plumbing, home improvement, woodworking. Easy to use: measure and saw miter angles, easy to use cutting tool. Find the angle that needs to be measured, lock then cut. No tedious operation.