Attwood Lock’N-Pin 3/4 in. Pin products offer outstanding ergonomical performance with a design that is proved by decades of experience. Power Pedestal for 3/4 in. Pin Seat Mount. Adjustable Height: 24 in. to 30 in. Post Diameter: 1.77 in. Threaded post with steel pin. Brushed aluminum finish. Lock’N-Pin products exceed ABYC Standard H31.6.1.