Quick-Hitch arbors with high speed steel (HSS), HSS extended length or carbide tipped pilot drills feature two locating pins inserted into the hole saw cap to prevent the hole saw overtightening on the screw thread. This allows easy and instant hole saw changes, without tools and without removing the arbor from the chuck. • For use with hole saws ranging from 32-210mm • Permit instant change of hole saws without tools or removing the arbor from the chuckCountry of Origin: CN Specifications Arbor Shank Sizes metric: 11 hex (excluding SDS-Plus Arbors)mm Arbor Shank Sizes imperial: 7/16 hex (excluding SDS-Plus arbors)" Screw Thread: 5/5-18 UNF" Drill Length metric: 100mm Drill Length imperial: 3,15/16" Fits Hole Saw Diameter metric: 32 - 210mm