QUICK CONNECT EXPANSION - The Kuat Piston Pro X Add-Ons seamlessly integrate with the main rack using the innovative QuickConnect system; DURABLE CONSTRUCTION - The Piston Pro X Add-On is constructed with 99% metal components and finished with durable TIGER DRYLAC powder coating, guaranteeing that your bike rack extension will maintain its sleek appearance and structural integrity for years of adventure-filled use; KASHIMA-COATED HYDRO-PNEUMATIC ARMS - Experience the luxury of Genuine Kashima Coat hydro-pneumatic tire arms on your add-on trays; FASTFIT VERSATILITY - The Piston Pro X Add-On features Kuat's innovative FastFit tool-free tire chock system; INTEGRATED LIGHTING SYSTEM - Enjoy enhanced safety and convenience with the Piston Pro X Add-Ons' built-in lighting system