*** Device creates desired and perfect shower floor mud (dry pack mortar mix) surface in the shower pan quick and easy. *** Process is 3 times faster than traditional way *** This is the cheapest way to build floor mud: no need to purchase extra accessories or materials for every shower you do. *** This device was designed for professional ceramic tile installers but can be used by home owners also. Professionals can save a time & efforts, have an easy process and increase performance to the top level. Home owner can save money on labor and have the best performance possible.*** Device can be used in shower pans with irregular surface: 95% of shower pans have wrinkles in shower pan liners; out of level shower floor surface; deeps, hills; irregular shape of concrete shower pans: steps, deeps, hills, concrete drops. But those are not an obstacle for this tool. *** Device still can be used when drain is out of level or when drain is not adjustable (can't be moved up or down) *** Working diameter is unlimited with extra strips attached. Shortest working radius is 17" long, which works in small 3' x 3' shower pan. Please, disregard "Limited option" customer's review where customer is referencing a previous model which was discontinued. *** Device is adjustable for different thickness of ceramic tile and stone. Kit for sale is set for 1/4 inch thick floor tile (4x4; 6x6). *** Device can be used on residential drains rounded or square shape - up to 5" diameter or 5" long side, which is maximum size for residential drains. *** This is the latest improved model, Model 3a (M3a). (Pictures 1-3) This model is for sale. All parts made from steel and strong grade aluminum. Aluminum parts ("Plate" and "Strips") in this kit are painted or not; color may vary. Texture of aluminum parts may vary.