Pack of 25 Prong T-nuts
25 M10 spider type nuts for climbing holds. These nuts slot into a 12mm hole through the back of a 12 to 21mm thick plank to screw into the holds with M10 Allen head bolts. Drilling into the wood must be done with a 12mm drill bit.
Instructions for use
Make holes in the plank at a distance between them of 15 to 30cm and place the nuts on the back, gently hit the nut so that the staples are nailed into the wood until it is flat. Put all the T prong nuts on the board before mounting it on the wall and carefully tighten the first turn of the screw when placing the holds so as not to dislodge the T prong nuts.