3/8" Spring Loaded Pull Pins /Pop Pins The applications for these are endless. Tube doors, steering columns, seat sliders, spare tire gates, hunting racks and many other quick release applications. Specs: Heavy duty spring loaded pin is a 1/2" long and 3/8" in diameter. 1" O.D. steel pin housing with a 1-1/2" length provides plenty of surface to weld in place. Rugged black impact resistant T handle latch is spring loaded. Overall height /length is 3.5" These are made from mild steel. Handle is Nylon plastic.