The Starrett A1 Arbor with 6.35mm (1/4") high speed steel pilot drill and 8.75mm (11/32") 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.
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.