Birzman Lockring Socket Shimano MF Compatible with Shimano MF Freewheels, or other similar 12-spline ∅22.7mm freewheels. Specification Functions: 1/2" Dr. Material: Alloy steel. Compatible with Shimano MF Freewheels, or other similar 12-spline ∅22.7mm freewheels.
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