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Type N to N adapters come in the standard variety, brass, 11ghz; and also a precision variety, stainless steel, 18ghz. N to N adapters can be used as connector savers (m/f). Standards committee's have settled on a 19mm hex, which either a 19mm (.748") or 3/4 (.75") torque wrench works with. Other common N adapter hex sizes are 13/16, 19mm, and 20mm.