Kits include: （ M8 ）4X stainless steel thread Eye Bolts, 4X stainless steel slot nuts, 4X stainless steel Heavy Duty Washer, 4X stainless steel Spring washer Heavy-duty stainless steel M8 : Rated 500kg working load , Made from anti-corrosive Stainless steel , Made from premium materials designed for use in harsh marine environments, No rust in salt water environment. This kit fits：Rhino roof rack, Rhino Pioneer platform roof rack, Thule roof rack, Pro Rack roof rack , Yakima roof rack, and other sport, commercial or heavy duty roof rack with T or C channels Create a tie off point on your roof racks - Quick Release Track Rail Adapter, Compatible with most track systems. Universal - A Tie Down Spot - Perfect to secure a cooler ,fishing plier lanyard ,paddle leash, fishing net , or other kayak accessories to the track. No more drilling Holes on the kayak again. Heavy-duty stainless steel M8 : Rated 500kg working load , Made from anti-corrosive Stainless steel , Made from premium materials designed for use in harsh marine environments, No rust in salt water environment. This kit fits：Rhino roof rack, Rhino Pioneer platform roof rack, Thule roof rack, Pro Rack roof rack , Yakima roof rack, and other sport, commercial or heavy duty roof rack with T or C channels Create a tie off point on your roof racks - Quick Release Track Rail Adapter, Compatible with most track systems. Universal - A Tie Down Spot - Perfect to secure a cooler ,fishing plier lanyard ,paddle leash, fishing net , or other kayak accessories to the track. No more drilling Holes on the kayak again.