38R4-4.5M

Carbide Insert Bit Ogee Fillet Bit 1″ Dia. x 1/4″ shank 5/8″ cut x 2 5/16″ length 4.5mm Radius                                   2 flutes Replacement Parts: Knife: 3138501 Ball Bearing: BB-12 Flat head screw for knife: 1930355                       Allen Key: 1940200 Flat Screw: 1930016