WINGONEER&reg; Prototype Screw/Terminal Block Shield Board Kit for Arduino MEGA 2560 R3 DIY Unassembled, variety mount methods, you can make flexible use. PCB: FR-4 fiber glass PCB, dual copper layers, size 120mm x 78mm. Pads grid / pitch 2.54mm / 0.1", hole diameter 0.8mm. Terminal block pitch 3.5mm / 0.138", hole diameter 1.2mm. Terminal Block: Pitch 3.5mm / 0.138" mini terminal blocks, total 84 pins(3pole x24pcs, 2pole x6pcs ). Wire range 26~16AWG, strip length 5mm, screws M2 steel, pin header and cage brass. Female Header Socket: Pitch 0.1"/2.54mm, pin length 15mm / 0.59" Single row 10pin x1pcs, singal row 8pin x 5pcs, dual row 18pin x1pcs. Note: This is not original Arduino product.it only a substitute accessories from WINGONEER