For use with the 1/4 inch system, use these connectors to split off of the armature by the foot. We highly recommend using the pliers to adding and attaching joints. The Y is best for adding leg split offs for dolls and the T is best for arms and heads. With the loop on top, you can use elastic to attach a head. Also for use with HVAC and aquariums. We reserve the right to make substitutions based on style, product line, & availability from the manufacturer (we use multiple manufacturers).