Wallnut Size 7DMM Walnut Size 7 DMM Wallnut are a staple of the climbing rack. They are light and a set gives you many placement options. Despite their simple appearance, Wallnuts are highly featured pieces of climbing hardware. Different alloy is used for each size smaller Wallnuts are made from a harder alloy to prevent shearing, while larger sizes are softer so they can bite into placements. Larger Wallnuts feature hollow construction to reduce weight. Wallnuts