30 Types of Pliers and Their Uses with [Pictures & PDF]- what are locking pliers used for in sewing projects pdf ,22/3/2021· This type of pliers is used to open nuts fixed on gas and oil pipes etc. Its opening can be enlarged or closed as per requirement like the slip joint pliers. Precautions of Using Pliers Pliers should not be used in place of a hammer, spanner, or wrench. For differentWhat is a Lockstitch Sewing Machine? (with pictures)Lockstitch sewing machines are most commonly found in the home and work by interlocking two threads from two bobbins for a sturdier stitch. A lockstitch sewing machine binds cloth together with two spools of thread and a needle with the eye at its base. Distinct from a chain stitch machine, a lockstitch sewing machine makes strong, straight seams.