For thick material up-cut chip removal. #hss1204, direction: up-cut, (d) diameter: 1/2, (r) radius: 1/4, (b) cutting height: 6, (d) shank: 1/2, overall length (l): 8, max rpm: 6,000, type: ball end, flutes: 4hss1204 high speed steel (hss) foam cutting ball end extended reach 1/4 radius x 1/2 die x 6 x 8 long x 1/2 shank cnc 4-flute spiral up-cut router bit tin coated.