attwood Lock'n Pin 3/4" Boat Seat Swivel Offset Polished Stainless Steel Lock'n Pin 3/4" Boat Seat Swivel Offset SP-7153-T-SS Polished Stainless Steel Lock'N-Pin systems lead the industry in safety Exceed ABYC Standard H31.6.1 Dimensions: 13" Height (fixed), 1.5" Diameter Threaded with polished stainless steel finish and stainless steel pin