3-piece L100 series coupling set includes two coupling halves and an NBR rubber insert. 1" bore with 1/4" keyway and 2 set screws on one coupling half. 1-1/4" bore with 1/4" keyway and 2 set screws on the matching coupling half. Interchangeable with Lovejoy, Martin, Browning, TB Woods, and other L-jaw couplers. 3-piece L100 series coupling set includes two coupling halves and an NBR rubber insert. 1" bore with 1/4" keyway and 2 set screws on one coupling half. 1-1/4" bore with 1/4" keyway and 2 set screws on the matching coupling half. Interchangeable with Lovejoy, Martin, Browning, TB Woods, and other L-jaw couplers.