Spring Loaded Pull Pins /Pop Pins The applications for these are endless. Tube doors, steering columns, seat sliders, spare tire gates and many other quick release applications. Specs: 1" O.D. steel weldable body pin housing with a 1-1/2" length provides plenty of surface to weld in place. Pin engagement length=1/2" Overall height/length is 3.5" The body is made from mild steel-pin is plated steel Billet Aluminum Handle-Handles are polished and clearcoated.