Adjustable Size: You can adjust the mobile base from 20.7" x 23.7" to 28" x 33.5". The user is able to change the mobile base size in 1-inch increments to suit various large machines and power tools. Applicable to various sizes of equipment. Fixed Feet & Universal Wheels: Fixed feet with rubber foot pads can effectively fix the mobile base. The rubber pad at the bottom is non-slip and shock-absorbing, not damaging the floor.The base is equipped with two 3 (7.6 cm) non-destructive ball-bearing casters that rotate 360°for free and stable gliding on uneven surfaces, including concrete floors. Low Profile Design: This tool stands mobile base raises the height of your machine by less than 1 inch. Meanwhile, it allows your equipment to be moved flexibly without affecting your everyday use of the devices. You only need to spend 5 minutes assembling it expeditiously. The base is equipped with two foot-operated steel locking lever, which controls the movement and fixation of the mobile base by foot. Extensive Use: The rolling mobile base is widely used for mobilizing various tools, such as table saws and band saws, woodworking equipment, planers, joiners, spindle sanders, refrigerators, and washing machine and other stationary power tools.