L110 series (3-1/4" Outside Diameter) flexible L-jaw coupling spider insert.
Urethane spiders are harder and longer lasting in high torque applications than comparable rubber spiders.
Urethane is rated for 1.5 times more torque than NBR / Buna-N / Nitrile rubber inserts and is more chemical and oil resistant.
Interchangeable with Lovejoy, Martin, Browning, TB Woods, and other L-jaw couplers.