Triangle 400 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. - 2nd smallest Blocz volume - Stacks well on other volumes - Low profile volume (great for slabs and vertical walls)- Symmetrical volume - Bomber T-nuts (metric T-nuts available upon request) Length 16 inches Height 6.5 inches T-nuts 6 Design options