1″ with 1/2″ shank, 15/16″ with 1/2″ shank, 7/8″ with 1/2″ shank, Spade bit shaft, 1/2″ shank, Tip 1″ spade with set screw, Tip 15/16 ” spade with set screw, Tip 5/8″ spade with set screw. (Special Order), Tip 7/8 ” spade with set screw
Made from 356 heat-treated cast aluminum, tougher than cast iron. Oil impregnated bronze bushings with extra long guide ways for accuracy and long life. With two 2-1/8″ spur bit guide holes and extra long backset blades. Adjusts for 2-3/8″, 2-3/4″, and 5″ backsets. The maximum thickness that can be drilled using this jig is 2-1/2″. The minimum is 1-1/4″.