Includes the 148 "Whisker??" Coupler & 158 "Scale" "Whisker??" Coupler.A must have tool for gauging mounting height, correct coupler height, trip pin, and permanent uncoupler heights for achieving trouble free coupler performance. Also has a built in HO track gauge. "Takes the guess work out".Kadee?? Quality Products Co. products are not toys and are not intended for children under 14 years old.KadeePart KAD206