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Product Description Premium-quality micrograin carbide tips are ground on specialized CNC equipment for an Extra-Fine finish With maximum sharpness and edge retention. Tongue and Groove bit cuts perfectly fitted tongue-and-groove joints. The fully hardened and tempered steel shank provides ultimate durability. From the Manufacturer Carbide tipped tongue and groove bits are micrograin bits designed to cut tongue and grooves on 1/2" through 3/4" thick material. To cut the tongue, use the complete assembly; to cut the groove, remove one slotting cutter