About this item High-quality Butt Connectors: butt connectors are made of C11000 pure copper, with the best conductivity and shape-shaping. The lowest resistivity reduces heat generation and extends the life of the wire. Perfect shapeability facilitates wire crimping and does not cause terminals to break. Pure copper has marine-grade corrosion resistance and is suitable for use in any extreme environment. Multiple Assortments: One pack for all needs, Butt Splice Connectors Kit(8 Gauge*5 PCS, 12-10 Gauge*10 PCS, 14-12 Gauge*25 PCS, 16-14 Gauge*25 PCS, 22-16 Gauge*25 PCS, 24-18 Gauge*30 PCS, 26-22 Gauge*30 PCS).Rated For 600 Volts. Designed to fit solid or stranded copper wire. Humanized Design: Internal wire-stop structure assures proper length of insertion into terminal barrel. Chamfer barrel for easy wire insertion. Widely Used: This Uninsulated Butt Connectors are widely used in wire adjustment and repair on home appliances, automobiles, ocean ship, industrial electrical, and is also suitable for DIY. Recommended Heat Shrink Tubing: Non insulated butt splice wire connectors ensure connections get the strongest, longest lasting, and highest performing electrical connections between every wire, every time. For best results we recommend insulating your connections with dual wall, adhesive lined heat shrink tubing. Buyer Confidence: It’s important use with a compatible copper cable. Recommend to double-check the dimensions and ensure they are accurate before making a purchase so that your connection will indeed be secure and long-lasting. That is to say we would like the opportunity to make it right for you. Here's everything you need to get started.