Screw clamps. Screw clamps are types which use a screw mechanism to adjust the jaws and clamp a workpiece in place. The types which are found in the screw clamp category include G clamps (also known as C clamps), F clamps, edging clamps, wooden hand screw clamps and rack clamps.
Dry drowning usually happens soon after exiting the water, but with secondary drowning, there can be a delay of up to 24 hours before the person shows signs of distress. Both can cause trouble breathing and, in worst-case scenarios, death.
In 2013 there were about 1.7 million cases of drowning. Unintentional drowning is the third leading cause of unintentional injury resulting in death worldwide. In 2013 it was estimated to have resulted in 368,000 deaths down from 545,000 deaths in 1990. Of these deaths 82,000 occurred in children less than five years old.