Durable 5mm polypropylene construction with double-sided design shows face and edge joints. Hanging hole for storage. Compatible with the Kreg Jig® K3, K4, K4MS, K5 & R3. Works with 12mm, 16mm, 19mm, 22mm, 25mm, 28mm, 31mm, 35mm, 38mm (1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8", 1-1/2") material.