ITEM NAME:20x 4 Pin 2.54MM Female Stackable Header Connector Socket For Arduino Shield M&E Description: Type of Row: Single-Row Gender of Connector:Female Number of Pins: 4 Pin Pin pitch 2.54mm. Plastic height:8.5mm ±0.15mm Length of Pin:11mm ±0.25mm Quantity:20pcs Packing included: 20* Connector socket.Gender of Connector:Female. Length of Pin:11mm ±0.25mm. Pin pitch 2.54mm. Number of Pins: 4 Pin.