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Zipp Service Course Stem - 60mm 31.8 Clamp +/-6 1 1/8" Aluminum Blast BLK B2 Model=Ruffian Lock-On }Shimano GRX ST-RX810-L Shift/Brake LeverZipp Service Course Stem 60mm 31. 8 Clamp + 6 1 1 8" Aluminum Blast Black B2. The Zipp Service Course stem delivers all you look for in a high performance stem strength stiffness reliability a precise fit and great visual look. The SC stem offers a new faceplate and body design for greater stiffness and easier installation at a price that meets any riders budget. Forged AL 6061 Machined and relieved faceplate Features stainless steel hardware with