"Standard" head; metal "standard" shank couplers; medium centerset shank.
The most popular Kadee(R) coupler, fits most HO equipment. Coupler for standard height mounting platforms.
Couplers are interchangeable with 20, 30, and 40 Series couplers.
Includes 2 pair all metal couplers with insulated draft gear boxes and bronze centering springs plus instructions.
Simple "drop in" design.
It is not recommended to use a metal coupler directly on a metal surface or in a metal draft gear box to avoid the possible electrical crossover or shorting that may cause damage