Brand new QTL sure grip bushing N-4-3/4, split thru the taper and flange to provide a tight clamp on the shaft. The bore measures 4.75" in diameter, and has a 1-1/4" keyway with a 3/4-10 threaded hole for a set screw. The flange takes four 7/8-9x8 cap screws which are included. Overall length of the bushing is 8.