High Security: Rated voltage: 300V; Max. tolerable temperature: 105. With strong springs inside, the wire nuts fix cables more firmly than electrical tape does. Thick insulating plastic shells stop electric leakage. Ensure safer and stabler conduction. 5 Sizes & 5 Colors: Totally 50 wire caps in 5 different sizes (10 for each). Perfect for the wires with a gauge of 10 to 22 AWG. Each size of the caps comes in a unique color, making it really easy to distinguish and organize in daily use. Wide Application: Extremely helpful wiring accessories for radios, stereos, loudspeakers, lights, fans or other electric appliances. Practical to meet various electrical maintenance needs in homes, offices and cars. Easy to Use: First, remove the insulation of the wires with a wire stripper. Second, twist the wires together. Last, insert them into a wire nut and turn it clockwise until the wires are secured. Never fall off easily once installed. Portable Wire Connector: Super lightweight and compact for convenient carry. Great to be used indoors or outdoors without adding extra burden to your bag. A must-have for every family or professional electrician. Type:A/B Colour:As Shown Material:Plastic Package Contents: 1set * electrical wire nuts Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.