The SP Air Adjustable Wheel Cover, No. 7231AWC, is designed to stabilize the cutting action. This product has an adjustable cut depth, with a minimum depth of 1/8". It protects sub-surface objects such as wiring harnesses and provides accurate, clean cuts 90 degrees to the surface. This product fits SP Air models SP-7231 and SP-7231R, as well as the Mac branded MAC AT35A.