Turbuster's Hack Squat is packed with features and exceptional movements, the Plate Loaded line merges superior technology with a passion for fitness. This innovative product features a quick and easy lock-unlock handle mechanism for a seamless workout experience. It works on your quads, glutes, and calves. Three lockout positions are under the user's control throughout the exercises and provide user safety and the option of different start/stop positions. Olympic-style plates only.