Hole Saw Arbor, Arbor Type Standard, Thread Size 5/8 In.-18, Arbor Shank Style Hex, Arbor Shank Size 7/16 in, Fits Hole Saw Dia. - Imperial 1 1/4 in to 6 in, Fits Hole Saw Dia. - Metric 31.8 to 152.4 mm, Includes Pilot Bit Pilot Bit Included, Pilot Bit Shank Style Hex, Pilot Bit Shank Size 5/16 in