54-3/8" Truck Cap Topper Lock Rod Bars Used with most all truck cap manufactures. The 2 Point Heavy Duty Lock Bar System are used on fiberglass and aluminum truck cap rear doors. Generally used with single t-handle locks which are mounted in the center of the rear door. Features: Bars come with rod guides and cam. Used with T-handles that have a 5/16" square shaft and 1-1/2" mounting holes Can be used on rear or side doors on truck tops or RV compartments All locking bars are measured from end to end in a fully extended locked (closed)position of 54-3/8" (open positions measure 53-1/8" ) When measuring, make sure the window opening is shorter than the 50-1/2" fully extended locked (closed)position Bars can be cut to match applications. (no returns accepted for cut bars)