3-Piece L110 Series coupling set includes two coupling Hubs & NBR rubber insert. 1-1/4" bore with 1/4" keyway and set screw on one coupling Hub. 1-1/2" bore with No keyway and set screw on Second coupling Hub. Compatible with Lovejoy, Martin, Browning, TB Woods, and other L-jaw couplers. Include - 1-1/4" Hub + 1-1/2" Hub + L110 Spider. General purpose straight jaw coupling hubs attach to motor and equipment shafts using a set screw or keyway. Two couplings of the same size are locked together with a compatible straight jaw spider. These hubs are interchangeable with other brands according to the coupling size identifier.