The Starrett A4 Arbor with 6.35mm (1/4") high speed steel pilot drill and 6.5mm (1/4") hex shank, fits hole saw diameters 14-30mm (9/16"-1.3/16"). A set screw in the body allows for easy replacement of the pilot drill. Screw thread 1/2"-20.
Look after the pennies and the pounds will look after themselves – as true today as its always been! And there’s some very simple steps that can be taken to reduce daily running costs of any business, across all departments.