Part Number A-21-B having (CAGE Code 75535) and FSC 3940 Blocks Tackle Rigging and Slings in stock with ready to ship. Get an instant quote for A-21-B Block And Tackle by Crosby Group Inc. Fill the form below with your desired order quantity, targeted price and the expected order-fulfilment date. Our dedicated account manager will get back to you within 15 minutes.