Features & Benefits: Fits SP AIR #SPJSP-7231, SPJSP-7231R, Fits also MAC AT35A (Mac Brand); Stabilizes Cutting action; Adjustable Cut Depth (Minimum 1/8"); Protests sub-surface objects (Wiring Harnesses, etc.); Provides accurate and clean cuts 90 degree to surface; Auto Body shops will use it to cutoff parts without damaging what is under the part. Anyone cutting metal, fiberglass etc. will be able to set how deep they would like the cut and increase their cut time with no worries.