Used for rounding off stair treads and handrails on double deck timber. Stairs and railings were originally rounded 3/4 with a drill. I think a 1 inch round looks better, especially on stair treads. . My Bosch 1615evs router has a 2 5.8 base hole. The 1-inch all-rounder CMT is 2 1/2 inches wide. Please make sure it fits your router base before purchasing. The CMT chisel cuts smooth and clean.