Safely & Efficiently: The retardant shell provides safety and insulation when wiring, -twisting wire is no needed. Safely connect without soldering or electrical tape, no necessary. Cone spring pull the into connector and screw on, spring insert a stable connection when working on wiring projects. Color-Coded: Include color-coded assortment of grey, blue, orange, yellow and red connectors, size fits for electrical wiring projects and applications, great addition to your electrical connector kit! Applications: The twist on electrical connectors are great theater, speaker wire, stere wiring, automotive, 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 , 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, come with 180pcs screw twist connector cap. Easy to Sotrage: screw-on assortment packed into a divided storage box to keep the different wire connectors separately. Covenient to storage and use. Features: No need -twisting wire, soldering or electrical tape, no necessary. Cone spring pull the into connector and screw on. size fit for electrical wire gauges, great addition to your electrical connector kit. Great theater, speaker wire, stere wiring, automotive, 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: color material: plastic 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 content, other are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.