Thank you……the white material is for chip control however I didn’t mention it because there are wood chips everywhere 😃. Thought someone would comment lol. I used a CMT 1/2” shank 1 1/2 diameter bit. This was the safest one to use in my porter cable router. The others they had were for a CMC machine and were a metric size shank and could spin in the collar. The black metal is a 2”x1” tubing I found and it works great to slide the router box along. I would suggest getting some “slip it” or something similar from lee valley and use it in the router trough to help slide the router back and forth. I use slip it on my table saw, jointer and thickness planer to help the wood slide on the surface. It is an excellent product and won’t stain the wood for finishings. Just rub it on the surface and wipe off.