About Shimano Deore SM-RT56 180mm 6 Bolt Disc Brake RotorShimano's SM-RT56 6-bolt disc brake rotors deliver consistent stopping power in all riding conditions. A new tightening plate construction makes for quick and secure installation. FeaturesQuicker installation - New tightening plate construction for easy and quick set up Designed for resin pad only Also available in 160 mm SpecificationsModel No: SM-RT56 Series: DEORE M6000 Series Remarks: With anti loosen tightening plate 6-bolt (P.C.D. 44 mm): Yes Outside Diameter: 160mm Pad Material Compatibility: Resin Pad Lining Shape Compatibility: Narrow, Wide About ShimanoShimano is a Japanese multinational manufacturer founded in 1921 by Shozaburo Shimano. They are well known as the largest bicycle component manufacturer in the world with their main manufacturing plants in Kunshan, China; Malaysia; and Singapore. Along with cycling components they also produce fishing tackle, and rowing equipment.