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. Recommended for Constant and Dual Pitch Bi Metal Hole Saws
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