For use with the 3/32 inch system, use these connectors to split off of the armature by the foot. For little dolls or sculpture 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).