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Specification: Material:high-impact plastic Packing include: 18 pieces positioning squares 4 x 3inch positioning squares 4 x 4inch positioning squares in inches and millimeters Feature: strong, useful, firm. Square up perfect corners in your woodworking projects. Embossed gradation on both the inside and outside edges of each square.Handy interior notch further A variety of sizes, more affordable price. How to use: Place a square in the corner of the two stock pieces you need to square and secure with a set of clamps.