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Another key difference between sergers and overlock machines is the number of threads that they use. Sergers typically use 3 or 4 threads, whereas overlock machines can use anywhere from 2 to 8 threads. The number of threads used affects the type of stitches that can be created, as well as the strength and durability of the finished seam

what's the difference between a serger and an overlock machine.

what's the difference between a serger and an overlock machine.