They are snatch blocks for steel cable - not fiber rope. They can actually be used as a block and tackle by running a cable from a winch around one of the pulleys on the double block, then around the single block, and secure the bitter end of the cable to the thimble on the double block.
You actually have a mis-matched pair, as both of them should be double pulleys to rig it correctly.
OR
Move the thimble and secure the bitter end of the cable to the single pulley, so you can utilize both sides of the double pulley.
It will be fairly easy to figure out just by experimenting a bit.
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