Are you looking for a professional, yet spring insert assembly set? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? , ! Our professional spring insert assembly set must meet you needs. It is one of the for you. Features - Color: As shown. - Size: 20.00X10.00X3.00cm/7.86X3.93X1.18 inch. - Material: Copper. - Suitable for distribution device, the electric power electric wire connection of electrical equipment and browsing. - Electrical crimp connectors for household, vehicle and more. Here you will find the right connectors for all your electrical wiring projects. - Comes with all you need to make solder less electrical repairs around the home, shop or outside. - Selected materials, high product safety performance, strong use and not easy to fall off. - Adopted from material, it is and use. Specification - 6.3 Type: Inner diameter: 6.3mm, thickness: 0.4mm(male), 0.8mm(female), compatible wire:0.75-2.5mm²(AWG 18-14) - 4. : Inner diameter: 4.8mm, thickness:0.35mm(male), 0.5mm(female), compatible wire:0.75-2.5mm²(AWG 18-14) - 2. : Inner diameter: 2.8mm, thickness:0.25mm(male), 0.5mm(female), compatible wire:0.5-1.5mm²(AWG 22-16) Package list: 540 x terminals