Merrithew Star Knob, 4 Prong 1/2" (Reformer) functional trainer Our aluminum barbell collars are

Our aluminum barbell collars are designed for quick and easy use

Thanks to the thick nylon construction and hard plastic end caps

More AWESOME features of the Plate Loaded Lat Pulldown Low Row Machine

Ideal for assisted pull ups and dips

Benefits of the Blitz Ski Trainer

Merrithew Star Knob, 4 Prong 1/2" (Reformer) functional trainer Our aluminum barbell collars areNote: Special Order Item. Please allow 2 3 weeks for item to arrive. Used on Reformer accessory board receptacles to attach Jumpboards, Cardio Tramp Rebounders, Rotational Diskboards and more! See model detail information below. Sold individually. Note: this product is for use with Merrithew brand equipment only. Details: For use on Reformers manufactured after May 1, 2010. For earlier model Reformers, use the five prong 3 8" Star Knob to attach