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.
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