Product Description Shimano sprocket lockring HB-7710-R / HB-7600-R - for track bike hubs The Shimano sprocket lockring for Dura-Ace Track HB-7710-R and HB-7600-R is a lockring that fixes the sprocket to the Track rear hub. The lockring is made of steel and has a 1.29 x 24 tpi thread. It is also compatible with HB-7600-A-R. Technical Information:Material:steelThreads:1.29" x 24 tpi (left-hand threaded)Compatibility:Dura-Ace Track HB-7710-RDura-Ace Track HB-7600-RDura-Ace Track HB-7600-A-RManufacturer Number:Y-27819000 Contents:1 x Shimano sprocket lockring Manufacturer: Shimano Europe B.V. High Tech Campus 92 5656 AG Eindhoven Netherlands info@shimano-eu.com