ITEM NAME:158pcs Home Electrical Wire Connector Cap Spring Inserted Twisted On Features: Plastic shell molding, interior steel, which has better electric conductivity and better grip the wire, wont fall off easily even with strong vibration. Waterproof wire connector caps are easy to twisted-on wire nuts to make secure electrical wire connections. Cone shaped spring holds the wires firmly together, tight wire spring makes quick and secure connections. Can be widely applied to electrical products, lighting, household wiring (like speaker wire, stereo wiring)and other wiring equipments. Assorted sizes for various electrical wire gauges, great addition to your electrical connectors. Easy to install, with no tools necessary. Quick and easy to connect. Specifications Material: PP Model and Color: P1(Grey), P2(Blue), P3(Orange), P4(Yellow), P6(Red) Quantity and Size(Outer diameter x Inner diameter):&;nbsp; P1: 40 Pcs, about 8.6 x 6.5 mm P2: 40 Pcs, about 9.9 x 7.1 mm P3: 50 Pcs, about 12.7 x 9.7 mm P4: 18 Pcs, about 14 x 11 mm P6: 10 Pcs, about 16.3 x 13 mm Package Include 158 Pcs x Electrical Wire Connector Caps &;nbsp; Note: Please allow 0-1 cm error due to manual measurement. please make sure you do not mind before you.Plastic shell molding, interior steel, which has better electric conductivity and better grip the wire, wont fall off easily even with strong vibration. Cone shaped spring holds the wires firmly together, tight wire spring makes quick and secure connections.