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Slim Spline narrow Acorn nut in Black USA , requires a spline fitting tool,purchase separately,20.5mm diameter.
Order tool seperately.
To fit holes with a 20.5 mm diameter.
Several threads available, at this time we are keeping in stock 1/2'' unf 7/16ths UNF 12mm 1.25 and 12mm 1.5, if another thread is required please get in touch and we can special order.