Ratchet wrenches can have 3/8in or1/2 in drives (Figure 3.64). They are ideally suited to a wide variety of nut turning operations,either fastening or unfastening. Initial hand ratcheting enables a tight or seized fastener to be slackened off prior torapid runoff using the air power. Also final tightening can be controlled by hand ratcheting after fast rundown using the air drive.


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