Hole Saw Accessories Hole Saw Arbor Shank Size 5/16 In. Shank Shape Hex Thread Size 5/8 In.-18 Fits Hole Saw Dia 1-1/4 in to 2 In. Pilot Drill Size 1/4 in Dia x 4-1/8 in L Material High Speed Steel Replacement Pilot Drill No Mfr No 10082 Overall Length 2 In. For Use With Mfr No 901 902 and 904 Bit Extensions Includes Pilot Drill Bit