This is a set of 10 screw on holds. They are up to 5 3/4" long and 11-13mm deep micro crimp. They can be stacked and flipped to change the difficulty. One way is a 90 degree edge and the other around 70-80 degrees. There will be slight variations as these are made from scraps that we get from making our volumes. There are no screw holes drilled. They are made from baltic birch plywood so they are dense and strong.