
The Starrett Prosite° Protractor takes the errpr-prone calculations out of the process of mitre cuts. Simply set your saw to the angle that you raed. Upside down or backwards, the reading is always correct. This easy-to-use tool has two scales. The red scale & arrow show the angle for a mitre joint, while the black arrows & scale provide the angle to fit a single work piece to an angle. It is ideal for carpenters, plumbers & all bilding trades that require the measuring & transfer