Product Description Over shank - medium (12 pair/card) is compatible with all magnetically operated couplers currently on the market. Is of simple installation and integrated spring. Durable Construction and fits HO Scale Trains. From the Manufacturer Over shank - medium (12 pair/card) is compatible with all magnetically operated couplers currently on the market. Is of simple installation and integrated spring. Durable Construction and fits HO Scale Trains. Compatible with all magnetically operated couplers currently on the market Simple installation Integrated spring Durable construction Fits HO Scale Trains ASIN B0006O84GC Item Weight 1.6 ounces Manufacturer Bachmann Industries Inc. Release date May 7, 2021 Item model number 78022 Product Dimensions 8 x 1 x 10 inches Manufacturer recommended age 14 years and up Is Discontinued By Manufacturer No