"Scale" Metal Couplers with Gearboxes - Medium (9/32") Centerset ShankThis industry leading coupler features an all metal standard coupler, and 634 standard centering spring and comes complete with an insulated draft gearbox and lid. The 58 Magne-Matic® "Scale" Metal Coupler may be mounted with the included 232 Gearbox or with other manufacturers cast-on coupler pockets.The 158 "Scale" Whisker® Coupler is equivalent to the 58 "Scale" Metal Coupler.It is not recommended to use a metal coupler directly on a metal surface or in a metal draft gearbox to avoid possible electrical crossover and shorting that may cause damage. Use the provided insulated gearbox.Package Includes:(2) Pair 58 "Scale" Metal Couplers - Medium Centerset Shank(2) Pair 634 Centering Spring NO.5® Style(2) Pair 232 Gearboxes(2) 625 Knuckle SpringsFeatures:Material - MetalShank Length - Medium (9/32") (center hole to back of coupler head)Coupler Offset - CentersetKnuckle Spring - 625Centering System - Standard ShankCentering Spring - 634 Centering Spring NO.5® StyleHead - "Scale" HeadWorks In Place of - NO.5®, 28, 118, 119, 148, 158, most medium centerset "clone" couplersWorks With - 213, 232, 234, 242, most manufacturer cast-on draft gearboxesMounting Specifications:Mounting Height - 29/64"Centerline - 25/64"Trip Pin Height - 1/32"Center Hole - 2-56 Insulated Screws are the most commonly used. (Screw length will vary)