This item includes one 13.5" Closed Cell C I Cutter with a Drill Attachment and free Ground UPS Shipping in the lower 48 States. It is designed to clean in between the studs. It is for removing foam below the level of the studs. It can also be used with the Depth Control Wheels to trim to the studs if you are trimming a job with very low quality aluminum studs and are worried about hurting them. You can clean the studs off first and run the Depth Control Wheels on the studs.