Make perfect joints with our Box Joint Jig (#59032, sold separately) and NEW Cauls! Uniformly spaced pressure points clamp individual box joint fingers at the corners to give you the tightest joints possible. Simply align the pressure points with box jointfingers and tighten in place with one or more Rockler 1'' x 15' Band Clamp (#58432, sold separately). Slots on the outside of the cauls are made to hold pennies firmly in place to supportyour Band Clamps at varying heights. Plastic cauls stand 6-1/4" (1/4" Cauls), 6-3/8"(3/8" Cauls) and 6-1/2" (1/2" Cauls) tall. Four Cauls per pack. Patent pending.