Overview for the 367-5280 4 Fork & Pick End Curb Box Key The Trumbull Curb Box Key is made of 5/8” carbon steel with a slotted end that is used on Erie and Minneapolis style rods. The slotted end also fits inside a curb box with a 1” pipe upper section. This Trumbull curb box key has three types of handles. Workers can choose between one with a plain handle or those with specialty handles. The fork end fits in a curb box lid with two holes. On the other hand the pick end is used to clear ice and dirt from the box lid.