Large Frame U-Bolt Kit U-bolts for mounting to frames up to 3 wide x 5-14 high Leg length is 6 with a thread length of 2 4 U-Bolts per kit.nuts and washers not included For use with our Roller Guide-Ons, Post Guide-Ons and Bunkboard Guide-Ons Genuine replacement part for C.E. Smith Part Numbers 27600, 27610, 27620, 27625, 27640, 27645, 27660 5 Bunk board style guide-ons PN 27600require 2 kits, all other guide-ons require 1 kit California Residents WARNING Cancer and Reproductive Harm - P65Warnin