Compatible with Achilleus, Achilleus NEW, Spider Max, Storm, Storm UP, Storm NEW, Storm LTD, Storm LTD NEW, Thunder, Thunder 2, Thunder 2 NEW, Ultra 2, Ultra 2 Upgrade, X, X2, X2 UP, this hydraulic brake pad spring - nutt is part of the brake assembly and brake pads subassembly. It supports reliable braking performance and a secure fit.