Introducing 6 in. 90° Positioning Squares with Universal Fence Clamps by POWERTECH. (90° Positioning Squares.) This 4-pack of assembly square tools is the ideal solution when you need to square up perfect corners in your woodworking and assembling applications. Designed to hold joints firmly and perfectly squared at an exact 90° angle. Also assist with squaring during the glue up stage. Some experts and DIY enthusiast even find it useful to incorporate them into their jigs and fixtures. (Universal Fence Clamps) These Clamps are essential when you want to quickly and easily attach an auxiliary surface or fence to the existing fence on your band saw, table saw, router table, etc. This handy device firmly squares the new auxiliary-barrier flush against the machine's fence, assuring the protection and integrity of both the machine's fence and saw. Designed to stay clear out of the way of your woodworking. You'll wonder what you ever did without these time-saving accessories. Fit a multitude of fences, from 1/2 in. to 5-3/4 in. thick. Practical, reliable, ultra-rugged. Material: Plastic.