This ingenious tool features both interchangeable cutting edges and an interchangeable guide collar, enabling you to cut a wide range of rabbets. Changing the collars on the twin ball-bearing guide steps The cut width in 1/16" Increments from flush through 3/4" With five extra "plywood" sizes.#Rc-49360, diameter (D): 2, cutting height (B): 30mm, Shank (D): 1/2, overall length (L): 3-D/8, replacement knives: rck-30, flutes: 2, C: 5/8 & 3/4, RC-49360 insert superabbet Jr 2 DIA x 30mm x 1/2 inch shank