mild steel Made in USA Mild Steel Powder coated (Baked) Finish Easy install no tools required Protect Your Batteries Welded in USA Plastic battery box is not included Battery Shackle - RV Battery Lock. Protect your battery from theft. Our steel battery lock is proven to stop battery lock theft. One size fits all group 24 batteries (Up to 27 inches long). Secure your battery in the theft-proof embrace of Battery Shackle. It's steel cage is built by certified welders in the US. USE BATTERY SHACKLE ON: -RV Batteries -Boat Batteries -Generators This battery lock is designed for Dual Group 24 batteries. All Battery Shackles come with 3 Free pad locks to use with your new Battery Shackle!