Hole Saw Arbor, Arbor Type Standard, Thread Size 5/8 In.-18, Arbor Shank Style Hex, Arbor Shank Size 3/8 in, Fits Hole Saw Dia. - Imperial 1 1/4 in to 6 5/8 in, Fits Hole Saw Dia. - Metric 32 to 152 mm, Pilot Bit Shank Style Hex