Safely & Efficiently: The 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 , assorted size fits for most electrical wiring projects and applications, great addition to your electrical connector kit! Applications: The twist on electrical are great 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 , 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 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 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 50pcs Blue #20 - #18 AWG wire 50pcs Orange #18 - #16 AWG wire 18pcs Yellow #14 - #16 AWG wire 12pcs Red #14 - #12 AWG wire 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.