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Made of high quality aluminum bar stock. Light weight design. Fits all standard blades with 8 mm hub and 3mm hole. Adjust pitch to trim your power setup wattage and flight performance to exactly what your airframe needs. Adjustment range varies with each blade/spinner combination. Typically, with a 12x6 blade set, the pitch could be set between 12x3 and 12x9. 4mm collet included, other sizes available below. Weight 1.9 oz. SKU Number: MPIPU50
 "MPI Adjustable Pitch Folding propr Hub 50mm")