Amana Tool 45475-S Carbide Tipped Dado Clean Out 3/8 D x 1/4 CH x 1/4 Inch SHK w/Upper Ball Bearing Router Bit Carbide Tipped 1/4 Inch Shank SPECIFICATIONS: Diameter (D): 3/8 Cutting Height (B): 1/4 Shank (d): 1/4 Overall Length (L): 1-3/4 Replacement Collar: 47764 Replacement Bearing: 47751(2) Flutes: 2