The image shows a Crosby McKissick 419 Light Champion Snatch Block, a type of heavy-duty pulley used primarily in rigging and recovery operations. These blocks are designed to either increase the pulling power of a winch or change the direction of a pulling force, offering versatility in tasks like vehicle recovery, construction, and industrial lifting. They feature a hinged side plate for easy insertion of rope or cable and are available with various end fittings like hooks or shackles.