Wheels Manufacturing makes quality stuff. This is bottom bracket for the BB86 application that joins the two bearings together eliminating the dreaded BB creak from the standard separate press bearings, The drive side bearing and sleeve is pressed in, then u thread the non drive cup in and use a special wrench to pull it tight. Very slick component and well worth the price if you are looking for something better, and I was. Thanks Wheels for rethinking a poor design.