I use one of these.
If you're looking to cut something to size you should consider the frogmat idea.
"I can get a good look at a T-bone by sticking my head up a bull's a$$, but I'd rather take a butcher's word for it". - Tommy Callahan III
Backwoods Ext. Party, Vision Kamado, 22" WSM, 22.5 Weber OTS, Mini WSM, UDS "No.8"
Napkin Killers BBQ