HARDWARE - Screw Hook Use for winching heavy feeders, brooders and nests Lag threads Zinc plate and stainless steel available Size: 1/4″X 3-1/2″ 1/4″X 4-1/2″ 5/16″X 3-1/2″ 5/16″X 4-1/2″ 6mmX80mm 6mmX90mm 7mmX160mm 7mmX200mm and other you need Screw Hook