This is a 7/8" scale detail part. Poling pockets were common during the steam and first generation diesel era. These were located as pairs on the ends of freight cars and locomotives. Although used frequently in switching operations late in the 1800's and early 1900's, the practice of "poling" to push cars on an adjacent track was dropped by the railroads either voluntarily or by regualtion due to the extreme danger to crews on the ground.
This detail item has four mounitng holes of .045" diameter. These can be used as delivered or enlarged, so that you can attach these with nuts & bolts.
This detail item includes 4 pockets, enough to equip both ends of a single locomotive or car.