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.
It's an unbelievable statistic: According to the CDC, drowning is the number one cause of unintentional death for children between the ages of 1 and 4. And according to the U.S. Consumer Product Safety Commission, 390 deaths a year on average are attributed to drowning in a swimming pool or at a spa.