These inserts are made out of billet aluminum and will replace either 1" or 1-3/8" dzus springs. The aluminum housing holds a 5/16-18 coarse nylon locknut instead of a pressed in threaded insert. The locknut keeps the bolts from coming loose. Also, if you cross thread a normal insert, you'll have to drill the rivets out and change the whole piece. With the locknut, just knock it out and put a new locknut in.
This kit comes with 3 aluminum inserts, 3 steel bolts, and 6 pop rivets.
Steel Bolt Kit weighs 2.8 ozs.