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Scissors cut material by applying at the cutting location a local shear stress which exceeds the material's shear strength. Some scissors have an appendage, called a finger brace or finger tang, below the index finger hole for the middle finger to rest on to provide for better control and more power in precision cutting.
The most common locking mechanism is a handle ratchet, which consists of an asymmetrically serrated short protrusion near the finger loop of one of the handles, and a corresponding hook on the other. As the forceps are closed, the opposing teeth engage and interlock, keeping the handles adducted and the jaw surfaces clamped constantly.
Lucet may unravel if cut, but is easily fixed with a small knot. Unlike other braiding techniques such as kumihimo, finger-loop braiding or plaiting, where the threads are of a finite length, lucetted (or knitted) [a] braids can be created without pre-measuring threads and so it is a technique suited for very long cords.
Another simple little implement, to act as cigar-cutter and holder... The double cutter at one side takes off the end of the cigar, and, when closed, acts as a hold for the finger and thumb, the opposite arms closing round the cigar and securing it very firmly. A small loop on one of the cutters allows it to be attached to the watch-chain if ...
There are two main mechanical types of scissors used in surgery: Ring scissors, which look and function much like standard utility scissors with ring finger loops; Spring forceps are small scissors used mostly in eye surgery or microsurgery. The handles end in flat springs connected with a pivot joint.
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