We supply T-nut fixings which lie flush with the surface of the board, simplifying the laying of the tessera. Each set of fixings comprises two each of T-nuts, bolts and D-rings with which to hang a single board. So if you are going to cut up your board don't forget to order more fixings! Note: the fixings must be attached to the board before affixing the mosaic. For instructions on attaching the fixings, click here. I have stress-tested a single D-Ring up to 25kgs without problems, so a set of two will easily handle up to 40kgs.