Replaces the pull pin for your Bulldog 2,000-lb to 5,000-lb topwind, pipe-mount swivel jack (BD158451, BD158452, 150441, BD158488, or BD178151). Chain Secures to side of the jack so you don't ... don't lose the pin Specs: Pin diameter: 9/16" Overall pin length: 3-1/2" Usable pin length: 2-1/2" Fits: Bulldog 2,000-lb to 5,000-lb topwind, pipe-mount swivel jacks: BD158451, BD158452