Description This kit includes the 5 parts that are required to fasten the two flat straight arms (upper hinge arm and lower support arm) to a single point at the front edge of the top step. You need one kit for each side of your step. Included: Pivot Pin - ITM-1180PP Socket Screw - ITM-1180AB Brass Washer - ITM-1180BW Wave Washer - ITM-1180WW Countersunk Washer - ITM-1180CW