The Battery Shackle Lock protects your RV batteries with a one-eighth of an inch thick steel lock which is the perfect way to protect your batteries. One size fits most batteries, but they also offer a 27″ Battery Shackle to better conform to a smaller battery. The Battery Shackle has a hinge that makes it accessible with zero horizontal clearance. No tools are required, and it takes three padlocks. It is impossible to move without grinders, bolt cutters, or a cutting torch, so you know your battery is secure.