This deluxe 250 watt pistol grip grooving iron has a solid brass head that keeps the heat "just ahead" of the cutting blade. This preheats the rubber, making it fast and easy to cut the grooves and maintain accurate control. This unit comes with a .215" wide cutting head and 12 matching cutting blades. Extra heads (Part No. 3716-Size) and blades (3717-Size) in this width as well as a wider .375" size are also available.