What you get: 150pcs 22-16 AWG non insulated butt connectors, 120pcs 16-14 AWG non insulated butt connectors, and 30pcs 12-10 AWG non insulated butt connectors. Material: The wire butt connectors are made from high-quality copper tubular with tinned surface for corrosion protection. Easy to use: The uninsulated butt connectors are great for non-bulky splices, simplify the process of electrical splicing. Chamfering: remove the burr, and also easy to connect with electrical wire. The WIRE-STOP structure design helps you to insert wire into the right place to ensure the effect of crimping. Function and Use: These wire crimp butt connectors are works good when building custom wire harnesses or making repairs to existing wiring.