The Parabola Saw from MK Diamond reduces the cutting time to less than seven minutes by using a spherical cutting blade that prevents misalignment and improves cutting speed. The spherical shape also reduces vibration during cutting and prevents loss of tension when cutting tight circles. With its circular cutting ability, cross cutting is eliminated. The spherical shape makes for simple removal of the cut area. The spherical cutting blade and adjustable arms allow the cutter to be set to cut 47- or 59-inch diameters up to 6 inches deep. These blades have super-hard inserts at fixed intervals into peripheral that prevent undercutting and blade deterioration. A 5-gallon water canister eliminates the need for a continuous water source. In addition to manhole leveling, the saw can be used for traffic loop and decorative concrete scoring. It easily transitions between circular and straight-line cutting. 800/421-5830; www.mkdiamond.com.