An overlocker performs some very special and specific types of stitches and is used alongside your sewing machine to create lovely professional looking garments. An overlocker is not a substitute for a sewing machine though, so if you don't have a sewing machine yet, first go and have a look at our range of sewing machines. An overlocker has a small knife that cuts the fabric before enveloping the edge of the fabric in loops of thread. This creates a clean finish and protects the edge from fraying.