Clamp Block Set For Kmr Barrel Nut Constructed From Grade 5 Titanium Raw Titanium Finish Set Weighs 5.5 Grams Lifetime Warranty Made In The United States Item Ships As A Set (2 Clamp Blocks). Kmr Screws Are Not Included. Use With V Seven Ti Kmr Barrel Nut Mfg: V Seven Weapon Systems