These specialized pliers are an E-ticket ride for mechanical tinkering. Robotics, printers, or tape dispensers any device with small rotating shafts will have a few pesky E-ring clips. Never lose another E-ring, no more prying tiny clips off with a screwdriver, and no struggling to push the ring into its groove with an improvised tool.The jaws are magnetized near the tip to keep that that little E-ring in place even when the jaws are open.The small size fits shafts of approximately 3 to 5 mm diameter.The medium size fits shafts of approximately 6 to 9 mm diameter.