25mm, Designed to fit a 25mm sway bar. Whiteline's sway bar mount bushings not only boasts the latest in bushing material technology but a high performing PTFE inner lining boasting an extraordinary low coefficient of friction. This inner lining eliminates the need to lubricate the bushing on installation and therefore makes these bushing 'grease free'! Backed up by a Limited Lifetime Warranty. Whiteline bushings are made from the latest highest quality synthetic elastomer and designed to synchronize your suspension system for optimal safety, handling, performance, ride quality, longevity and reduced maintenance. They are the most positive link between your vehicles body, springs, struts, arms, bars and shocks., Limited Lifetime Warranty