Spine, Stiffener, for 12 inch (305mm) CARCASE SAW, BRASS, 1/4 x 3/4 inch (6.35 x 19mm), Slot Depth 0.300 inch (7.62mm), for Blade Thickness of 0.020 inch (0.508mm)
Austrian made, tool steel bit with dual rim lips and wide chip gates which don't bind up. These cut a hole as cleanly as forstners and are easier to hone and sharpen.