Nilight 220PCS Wire Nuts Kit 5 Sizes Electrical Wire Caps Assortment Spring Thread Insulated Wire Screw Terminals Twist on Wire Connectors for 22-12 AWG Wires, 2 Years Warranty. This assortment includes 5 different sizes wire caps. More versatile and covers the size range of 22-12 AWG wires. Each of them are color-coded and adds much needed for the different uses.