Triangle 400 Flat Interested? Please Contact us All volumes can be bolted on or screwed on, are made of 13 layer ¾ inch (18 mm) high-quality birch plywood, and coated with our special Blocz Texture. - Lowest profile Blocz volume (great for slabs and vertical walls) - Stacks well on other volumes- Symmetrical volume- Bomber T-nuts (metric T-nuts available upon request) Length 16 inches Height 4.5 inches T-nuts 9 Design options Base plate