Electronics-Salon DIN Rail Mount Adapter/Prototype PCB Kit For Arduino UNO / Mega 2560 etc. DIN Rail Mount Adapter/Prototype PCB Kit For Arduino UNO / Mega 2560 etc. FR-4 fiber glass PCB, dual copper layers, size 59mm x 53.3mm. Pads grid / pitch 2.54mm / 0.1", hole diameter 0.9mm. Adapter(feet) 1 pair, screws 4 pcs. for 35mm, 32mm or 15mm DIN rail. Nylon screwless type standoff 4 pcs.