The toothed arch block 12 is mounted in the smoothly arched notch 101 inside the box end 10 and forced or biased by the spring 12 into {HEAD ~ engagement} with the ratchet wheel 11 to limit {TAIL ~ the rotary motion} of the ratchet wheel 11 in the box end 10 of the wrench 1 in one direction 
The toothed arch block 12 is mounted in the smoothly arched notch 101 inside the box end 10 and forced or biased by the spring 12 into { HEAD ~ engagement } with the ratchet wheel 11 to limit { TAIL ~ the rotary motion } of the ratchet wheel 11 in the box end 10 of the wrench 1 in one direction
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