Standard arbors with pilot drill are suitable for use with hole saws from 14mm (9/16") diameter to 210mm (8.9/32") diameter. Available in standard or quick-hitch locking styles, with hex shanks or SDS-Plus shanks. For use with hole saws ranging from 14mm-210mm Standard or Quick-Hitch locking styles Hex and SDS-Plus shanks Choice of HSS, extended length HSS and carbide tipped pilot drillsCountry of Origin: CN Specifications Arbor Shank Sizes metric: 8.75 hex (excluding SDS-Plus Arbors)mm Arbor Shank Si... - Manufacturers part number: AY1391