Lasts up to 50x longer than HCS hole saw in tough materials.\t Extreme durability is built in with Bosch Carbide Technology.\t Efficient chip extraction through large slots.\t For use with the Bosch Power Change Plus keyless arbor: offering accuracy and robustness.\tIdeal for softwood, chipboard, brick and plastics.\t Diameter mm: 70 Diameter inches: 2 3/4 Working length mm: 60