Fitment: Upgraded Set of 4 Rollers Replacement for Total Gym Wheels/Roller, Gym replacement wheel kit fits for all fitness room models 2000, 3000, 3000 XL and some early XL. Size: The bearings have a through-hole diameter of approximately 1/4"(M6). The outer diameter and the inner diameter of the wheel (Plastic part) are 1.25" and 0.75". PLEASE check whether the product size meets your needs before buying. Materials: Gym replacement rollers are made of high quality engineering plastic. Stronger pressure-bearing capacity. The bearings are made of high-pressure forged steel. Quieter when working. Give you a better application experience. Advanced: Gym replacement wheel's overall design adopts a newly upgraded circular wheels structure, which is more durable, better withstand the pressure and is not easy to be damaged. Installation: Easy to install. Perfect fit. Please note that these will not fit if the wheels of your total gym's bearing sticking out on one side. Additional hardwares may be required in addition with the M6 bolts to adapt the wheels under the glideboard of the total gym's device. Gym Replacement wheels are made of high-quality plastic and high-pressure forging steel, which is more durable and stable in performance. Gym Replacement rollers is a standard size, which is convenient and fast installation. It perfectly matches your device to save you time. Compatible for Total Gym Wheels/Rollers, Fits for Gym Models 2000 3000 Some 3000 XL and a Few Very Early XL. Note: The diameter of the bearing is about 0.25 ", and it can be used almost all other Gym models through the M6 bolt. Package Included: 4 x Replacement Wheel