The FR-4 is designed to fit the 20-spline tool fittings found on older SunTour® freewheels.
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Product description
The FR-4 is designed to fit the 20-spline tool fittings found on older SunTour® freewheels. Constructed from heat treated alloy tool steel, the FR-4 features a 1" tool fitting for use with an adjustable wrench, socket, or bench vise.
