The Atlas TC755DAA is a "professional tire dealer" or "large car dealership" tilt-back style rim clamp tire changer. This version of the Atlas TC755 comes with the Atlas DAA-T dual assist arm package, made up of a left hand mounted arm with a pressing block and pressing/lifting disk and a right hand mounted arm with a pressing/lifting disk and bead roller. The dual assist arms are a necessary tool if you will be changing a high number of stiff sidewall, low profile, runflat style tires. The DAA acts as an extra set of hands saving a single user time and effort. The Atlas TC755DAA features a foot operated Tilt-Back column allowing the user to quickly and easily mount and un-mount tires from the table without worrying about moving an arm or hitting the column. With the tilt back feature the TC755 also has a pneumatic locking mount/demount head which greatly lowers the risk of the head moving during use and possibly damaging the rim or tire. The TC755 comes standard with an extra large turntable which means it can "clamp" most 26 inch chrome rims without the need for adapters. Atlas TC755DAA features a built in "Beadblaster" system. The "Beadblaster" system helps inflate stiff sidewall or other "hard to inflate" tires. The TC755 also has a powerful hand controlled bead breaker located on the side of the machine which is designed to break even the most stubborn and rusted beads without damage to the rim. The turntable jaws (which can be covered with plastic covers) hold the rim securely without damaging the surface of the rim. These jaws can be moved to three different positions along the slide of the turntable to either increase or decrease the clamping range, and to handle the widest variety of tires. The Atlas TC755DAA requires some assembly after purchase.