Safely & Efficiently: The flame retardant shell provides safety and insulation when wiring, pre-twisting wire is no needed. Safely connect wires without soldering or electrical tape, no tools necessary. Cone shaped spring pull the wires into connector and screw on, spring insert a stable connection when working on wiring projects. Five Color-Coded: Include five color-coded assortment of grey, blue, orange, yellow and red connectors, assorted size fits for most electrical wiring projects and applications, great addition to your electrical connector kit Applications: The twist on electrical connectors are great for home theater, speaker wire, stere wiring, automotive, marine wiring projects, househould wiring projects, commercial or residential applications, etc. Assortment Gauge: 50pcs Gray wire nuts, min 2x 22 max 2x 16, 50pcs Blue wire but, min 2x 22 max 3x 16; 50pcs Orange wire nuts min 1x 18 and 1x 20 max 4x 16 and 1x 20; 18pcs Yellow wire nuts min 2x 18 max 4x 14 and 1x 18; 12pcs Red wire nuts min 2x 14 max 2x 10 and 2x 12, total come with 180pcs screw twist connector cap. Easy to Sotrage: Our screw-on wire connector assortment packed into a divided storage box to keep the different wire connectors separately. Covenient to storage and use. Features: No need pre-twisting wire, soldering or electrical tape, no tools necessary. Cone shaped spring pull the wires into connector and screw on. Assorted size fit for various electrical wire gauges, great addition to your electrical connector kit. Great for home theater, speaker wire, stere wiring, automotive, marine wiring projects, househould wiring projects, commercial or residential applications, etc. Maximum Rated Voltage: Grey, Blue and Orange (300 Volts), Yellow and Red (600 Volts) Color: picture color material: plastic Package Included: 50pcs Grey 22 - 20 AWG wire connectors 50pcs Blue 20 - 18 AWG wire connectors 50pcs Orange 18 - 16 AWG wire connectors 18pcs Yellow 14 - 16 AWG wire connectors 12pcs Red 14 - 12 AWG wire connectors Only the above package content, other products are not included. Note: Light 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.