The trend countersink set contains five heat treated tool steel countersinks with hex shafts they are fitted with high speed steel drill bits to cover the full range of screw sizes and are self clearing they are adjustable for different length screws and will produce a 95mm 38in or 127mm 12in diameter counterbored hole to fit standard woodplugs contains 1 x 20mm 564in drill and cs size no41 x 24mm 332in drill and cs size no61 x 28mm 764in drill and cs size no81 x 32mm 18in drill and cs size no10