The HO Scale Kadee(R) No. 158 Scale Whisker(R) Metal Coupler will work anywhere a No. 5(R), #28, #38, #58, #118, #119 and #148 Coupler will work. This coupler features an all-metal coupler head, shank, and Whisker centering spring. The #158 Magne-Matic(R) Whisker Metal Coupler may be mounted with the #213, #232, #234, #242, #252, #262 Gearboxes (not included) or with other manufacturers cast-on coupler pockets. 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. No. 148 Whisker Metal Couplers are part of the extensive line of Kadee HO Scale knuckle couplers.WARNING: This product can expose you to chemicals, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov