One extension securely holds both Spyder Hex8 and Hex10 hole saw pilot bits for increased reach Hex8 arbor 3/8-inch hex, -inch-20 thread Hex10 arbor 1/2-inch hex, -inch-18 thread Spin on, spin off saw mounting Hex10 arbor adapter torque pins prevent the saw from becoming wedged onto the arbor, making saw changes quick and easy.
