I used these cutters to clean the sides of a set of doors I was building, I have a new RV garage that will also fit my motorcycle and I wanted to make a set of insulated doors, which would open one for access and both for my Harley to access his garage. I glued pressure treated plywood together to make LP 50yr siding with PVC siding panels. I used these cutters to cut all the sides as I laid the plywood frame on and glued it together. The first frame was about the size of a stencil so when gluing the frames together I trimmed the edges and also scraped off any glue that squeezed out. I also used a thinner one to cut the panels, I sheathed the LP on the outside and glued it on 2 sides a few inches bigger than the door, I trimmed the panels with these bits. They worked very well. From my own experience I recommend these beats.