McKissick snatch blocks provide the most complete line of blocks in the
industry, they are dual rated with a design factor of 4 to 1 metric and 4.5 to 1
in short tons. The blocks are identified by type, size of block, size of wire
line to be used, work load limit (in metric tons and short tons).
Western and marine single blocks are proof tested to twice the Resultant Safe
Working Load and marked with a working load equal to one half the resultant
load. Double blocks are