3-Piece L075 Series coupling set includes two coupling Hubs & NBR rubber insert. 5/8" bore with 3/16" keyway and set screw on one coupling Hub. 5/8" bore with 3/16" keyway and set screw on the second coupling Hub. Compatible with Lovejoy, Martin, Browning, TB Woods, and other L-jaw couplers. Include-5/8"Hub + 5/8" Hub + L075 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.