Starrett Hole Saw Arbor, w/ Pilot Drill, A4, 1/4" Hex Chuck, 1/2"-20 Thread

Four regular models are available, each furnished with a 1/4"(6.35 mm) HSS pilot drill. Set-screw in the body allows easy replacement of the pilot drill. Quick-Hitch™ arbors permit instant change of hole saws without tools and without removing the arbor from the chuck. The No. A4 model is supplied with flats to fit a 5/8" (16 mm) wrench.