Dp5421bc, zinc, single, round, rail splice bracket, designed to be used with #5400 round, rail to join & hold 2 lengths of rail together, offset nail holes for quick placement, compatible with 5438 & 5439 snap on flashing brackets, embossed steel is for added strength, splice screws are inserted in holes at the end of rail, 1 splice bracket should be installed on every length of rail to lock it in place, includes lag bolt & spice screws.