3/8" crbtp v-groove bit. Carbide tipped. Designed for excellent smoothness of cut and balanced cutting. V-grooving bit gives exact radius grroove on every cut. Excellent for door-front grooving, decorative accents to furniture and plaques, lettering, and sign work. Cuts plywood, soft and hardwoods. Precise hook angle for efficient cutting. Double flute. End of bit relief for fast plunge cutting. 3/8" diameter 90 - 1/4" shank