Nice kit for the electronic experimenter, radio amateur and DIYers. Swap fans and heaters very fast without the hassle of the wiring.Features:PRACTICAL: 2.54mm pin pitch(terminal spacing), 2/3/4 pin, 250V AC/DC voltage rating, and 3A AC/DC current rating.USABLE WIRE RANGE: Suitable for wires between 28 AWG and 22 AWG, 1000V/min withstand voltage, 1000 Mohm insulation resistance.480PCS KIT: Includes male and female connector housings of 2-pin, 3-pin and 4-pin(20 pcs each) male and female pin connectors(180pcs each).WELL-MADE: Sized well and gives a nice snug fit without bump or wiggle. Made from qualified material without chemical smells.APPLICATION: Great kit for toys, robots, DIY aircraft, smart cars, printers connections, PCBs, computer fan header, replacement for arduino controllers and any DIY projects.Specifications:Material: ABS, Phospor bronze(terminal), Nylon 66 UL94V-0(housing)Color: BlackPitch(terminal spacing): 2.54mmPoles: 2, 3, 4 PinUsable Wire Range: AWG28 ~ AWG22Voltage Rating: 250V AC/DCCurrent Rating: 3A AC/DCWithstand Voltage: 1000V/minContact Resistance: 1000 MohmPackage Size: 19*10*2.2cm / 7.48*3.93* 0.86inPackage Weight: 138g / 4.86ozPacking List:20 * SM-2A Connector Housing20 * SM-2Y Connector Housing20 * SM-3A Connector Housing20 * SM-3Y Connector Housing20 * SM-4A Connector Housing20 * SM-4Y Connector Housing180 * SM-AT Connector180 * SM-AY Connector1 * Box