Squi.Jig Blue 3-In. Framing Jigs, 2-Pack can be used for a variety of applications, such as a framing square attachment, stair or rafter layout, a rip guide attachment for circular saws, holding a framing square upright, or to layout repeated angles on a speed square. Their tall profile allows a strong hold onto the workpiece while dual slots provide various different layout and fabrication processes. The slots are 5/16-in. to fit onto most squares and saws. The thumbscrews can be easily gripped with gloves on. Plus, they are made from anodized aluminum for durability.