Thumb break
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"Thumb snap" redirects here. For other uses, see Finger snapping.
A thumb break or retaining strap is a safety device installed on many holsters and sheaths to prevent a weapon from being unintentionally drawn.[1]
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The thumb break helps to prevent an unauthorized person from drawing a pistol or knife from another person's body. It also secures the weapon in the holster or sheath when its owner is engaged in vigorous activities such as parachuting, rappelling, or fighting.
The thumb break is made of the same material as the holster or sheath (i.e., leather or nylon), and may either be permanently attached or removable. The thumb break is held in place by a simple snap mechanism, usually metal, which may be disengaged by pushing the thumb upward against it.