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The smaller F516X112WF is used for the 1.125" diameter shafts as provided with the MACH1GTO mount.
DO NOT use your mount without the Counterweight Shaft Safety Knob and the appropriate Counterweight Safety Washer!
F516X112WF - 5/16" ID x 1.5" OD Stainless Steel for 1.125" diameter shafts with 6 and 9 lb. weights.
Recommended for: Mach2GTO, 400, 600 and 800 mounts.