B56.11.4, Hook-Type Forks and Fork Carriers for Powered Industrial Forklift Trucks. Perfect Steerable Transfer Cartludes standards related to hook-type fork carriers and the attaching elements of fork arms and load-handling attachments for forklift trucks, for trucks with manufacturers' rated capacities of up to, and Perfect Steerable Transfer Cartluding, 11,000 kg (24,000 lb).