1/2in Rounded Hex Shafts are compatible with the REV ION System and are a ready-to-use length of hex shaft that have been cut to length and have the ends tapped. The ends are tapped #10-32 in order to accept a screw and washer or shaft collar. The 1/2in hex is compatible with the shaft retention method of the MAXPlanetary output stage. The 1/2in Rounded Hex Shaft - 36in is not tapped.