54278 carbide Tipped raised panel Back cutter 1/4 radius x 1-3/4 dia x 7/16 x 1/2 inch shank, #54278, Specification, Diameter (D) 1-3/4, Cut depth (a) 5/8, radius (r) 1/4, cutting height (B) 7/16, shank (D) 1/2, overall length (L) 2-1/16, replacement bearing 47706, designed to cut back side of raised panels for a flush alignment with door frames. This Cutter can be used with any of our raised panel router bits.