Extreme Max 3005.4053 8" Guide-On Bolt Kit (on Trailer Frames up to 6-1/4" High) Kit includes 8 zinc-coated steel bolts 8 inch bolts accommodate trailer frames up to 6-1/4 inch For use with Extreme Max 45 inch Post guide-On (3005.2175), 65 inch Post Guide-On (3005.2178), Adjustable Roller Guide-On (3005.2184), , and Heavy-Duty Single Post Guide-On (3005.3837) Fully threaded 3/8 inch-16 x 8 inch cap head bolts