85/92 Suzuki LT250R billet frame plugs, there plugs are sold as a pair of 2 and go in the front frame tube like shown in the picture.
Notice to install these plugs properly the weld globs from bad welds inside the frame tube must be ground / filed down for proper fitment, they come with double O'rings to hold the into the frame tube but I recommend that you put a little clear silicone or adhesive on them when installing them to hold them securely in place.