Pentagon 500 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. $160.00 - 5 sided shape- Asymmetrical volume- Bomber T-nuts (metric T-nuts available upon request) Length 23 inches Height 6 inches T-nuts 7 Design options Base plate