Replacement bolder for Walthers HO scale 3 axle light weight passenger trucks. To mount on top of tabs of the metal side frames. With small kingpin hole, drill to size needed. Allows bolster to be attached to car first then sideframes screwed to bolster. Four screw holes modeled undersize, drill with #48 drill to use with factory screws. One pair, cut the small connecting strip to separate. For Walthers part numbers 920-2114 thru 2119. Trucks used under full domes and high level diner.