Carbide Tipped - down Shear angle - 3 flute with ball bearing guide. Special set Designed for luthier. This set includes five different bearings that will give five rabbet sizes (ledge cut)., #49342 diameter (D) 15mm (19/32), cutting Height (B) 11.5mm (7/16), shank (D) 1/4, overall length (L) 2-1/8, flutes 3, C 1.0mm (3/64) - 3.0mm (1/8), 49342 binding/Rabbeting 15mm (19/32) dia x 11.5mm (7/16) x 1/4 inch Shank router bit set