C.E. Smith Guide-On Large Frame U-Bolt Kit - U-bolts for mounting to frames up to 3in wide x 5-1/4in high. For use with our u-bolt mounted guide-ons. Genuine replacement part for C.E. Smith part numbers: 27600, 27610, 27620, 27625, 27640, 27645, 27660. 5ft Bunk board style guide-ons (P/N 27600) require (2) kits, all other guide-ons require (1) kit. Features: 3/8in-16 x 6in long x 3.5in wide with a thread length of 2in Zinc Plated 4 U-Bolts per kit (2 formed & 2 straight) Nuts and washers not included