Hole Saw Accessories Hole Saw Arbor Shank Size 5/16 In. Shank Shape Hex Thread Size 1/2 In.-20 Fits Hole Saw Dia 9/16 in to 1-3/16 In. Pilot Drill Size 1/4 in Dia x 3-1/4 in L Material High Speed Steel Replacement Pilot Drill No Mfr No 38526 Overall Length 6-13/64 In. For Use With Mfr No 901 904 Includes Pilot Drill Bit