Heavy Duty Concave Saws With Carbide Tips and Spoke Size:22" There is a slip on Category_Default Category Products Lateral Hand Rodding Tools B Series Tools and Sets There is a slip on type wheeled skid that can really travel down the line with 8 polypropylene wheels that reduce friction and thus saves valuable water They are great for riding over obstructions and giving the sewer nozzle a dolphin effect of up and down over and through debris fields They have 3 spokes that give the saw strengths and keep it tuning true in the sewer They are specially made to be 1” undersized in the sizes up to 18” and then 2” undersized for the 20” to 24” blades