A 3-wing carbide tipped slotting cutter used for running slots for panels, splines, and t-moldings, and for cutting tongue and groove joints. The cutters are 1-7/8" in diameter with a 5/16" bore. The matching arbors (sold separately) have a shaft length of 7/8" and come with a #rb5 bearing (allows a 1/2" depth of cut). Other cutting depths can be achieved by switching the bearing with other sizes (sold separately. Listed below):wsb20 - 9/16" depth of cutwsb25 - 3/8" depth of cutwsb26 - 1/4" depth of cutwsb27 - 5/8" depth of cutcutters and arbors sold separately. Made by Whiteside, USA.