Check the listing for details. Better Olympic to Standard Weight Plate Adapters. Color: Black, Condition: New. Listed at 29.99 USD. Flanged bushings to allow you to use Olympic size (2 inch bar diameter) weight plates on your Standard (1 inch diameter) bar. Absolutely no need to measure the thickness of your plates(s). With the Frey Innovations adapters, you use one matched pair of universal size adapters per one weight plate. What could be easier? Each order includes two pair (4 total) of adapter plates, to use with one pair of weight plates. Made in the USA US Patent Pending Weight plate and bar not included. Shipping to US only. Our apologies for the high cost of shipping, but the US Post Office has become unreliable (blames the Wuhan virus) so it is necessary to add tracking, and recent changes to eBay do not allow us to add tracking to regular First Class mail envelopes, so everything needs to be sent as a 'package' at a higher rate than in the past. Olympic weight plate adapter standard weight plate