Wall Type determines the required bolt length needed to pass through the hold and the climbing wall. If you are not purchasing hardware, this option doesn't matter.
Very large and easy to stand on block shapes help build confidence needed for stabilization on the wall.
Dimensions:
Length : 9"
Width : 3"
Sticks out from the wall : 3 1/2"
These attach with a 3/8" bolt and one screw so that the hold doesn't spin.