Make secure electrical wire connections by using the ABN Wire Twist Connector Wire Hub Caps. Color-coded electric screw caps come in gray to fit min 2x#22 max 2x#16 wires, blue for min 2x#22 max 3x#16 wires, orange for min 1x#18 and 1x#20 max 4x#16 and 1x#20 wires, yellow for min 2x#18 max 4x#14 and 1x#18 wires, and red min 2x#14 max 2x#10 and 2x#12 wires. Common sizes can be used for everyday electrical wiring projects. These electrical terminal caps include a spring insert for solid, stable connections to grab the wires firmly. The plastic storage case offers easy transportation, storage, and organization as it fits in your glove box or trunk. It also includes a sizing chart for quick reference. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.