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 ensure 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.