The MT3 saw holder accepts saws, milling cutters and slitting saws with a 1" center hole. It mounts directly in the MT3 mill spindle of the Midas machines and is held in position with the M12x1.75 drawbar that comes with the Midas machines. It can hold one or more milling cutters or saws with the use of arbor spacers and shims. Random sized spacers are mounted on the holder. Works with 58-500.