This compact 4-1/2 in. Finish Square is ideal for access in tight quarters for finish carpentry, setting saw blades and more. This rafter square also features continuous scribing notches that are ideal for ripping lumber from 1-1/2 in. to 3-1/2 in. as well as handy markers that measure 2x4 board dimensions of 1-1/2 in. and 3-1/2 in.