The GCEC340 Body Solid Plate Loaded Leg Extension/ Leg Curl features a fully adjustable range-of-motion device with pop-pin for easy adjustment. Can be adjusted while in exercise position. Uses 1 inch diameter standard weight plates (sold separately). You may purchase one of our olympic bar adapters to convert the machine to use Olympic plates. Large foam rollers and extra thick padding keep the user comfortable while exercising the hamstrings and quadriceps.