Extreme Max 3005.4050 7" Guide-On Bolt Kit (on Trailer Frames up to 5-1/2" High) Kit includes 8 zinc-coated steel bolts 7 inch bolts accommodate trailer frames up to 5-1/4 inch - 5-1/2 inch depending on guide-on model, see below 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), 2' Bunk Guide-On (3005.2196), 4' Bunk Guide-On (3005.2199), and Heavy-Duty Single Post Guide-On (3005.3837) Fully threaded 3/8 inch-16 x 7 inch cap head bolts