Convenient Design -- Mating male and female connectors can be connected and disconnected directly without soldering or taping for quick replacement of failed components. Durable and Safe -- The nylon female and male butt connectors are designed with a translucent tube that allows for visual inspection of inserted wires for accurate crimping. Insulated housings prevent electrical leakage and fire. Easy Crimping -- After tightly connecting the male and female terminals, crimp the terminals using specialized crimping pliers. The nylon housings are thick and durable and won't crack when you crimp them properly. They will fit together nicely for a snug fit. Box -- All insulated crimp connectors are perfectly enclosed in a plastic box for easy storage, transportation and organization. All are enclosed in plastic case. An easy connection to a step wires, insulated and sealed.Terminal set comes with 4 sizes 180 pcs insulated terminals and connectors for different purposes of use. Wide Applications -- Male and female wire connectors can meet industry requirements for automotive, consumer and industrial applications. Widely used in mechanical, electrical, home appliance, computer or other automated equipment that requires quick connection or disconnection of wires.Application: Very useful for home, factory, workshop, garage, etc. Recommended to electricians, technicians, home users, hobbyists and beginners.