This is the Up-Right 90?? Alignment Jig from House of Balsa. FEATURES: This 90?? alignment jig makes model building easy. Slotted for 1/16", 3/32" and 1/8" thick wing ribs. For use on bulkheads, horizontal and vertical tail and fuselage sides. Can also be used as a thickness gauge. Orange plastic construction. INCLUDES: One Up-Right 90?? Alignment Jig. SPECS: Length: 2" (5.1cm) Width: 2" (5.1cm)House Of BalsaPart HOUAC1