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Composed of galvanised, perforated metal sheet with a thickness of 1/32 inches (0.8 mm), with injected polypropylene wheels - polyethylene in the case of -22ºF (-30ºC) - which are mounted on a polished steel axle of 0.118 inches (-3 mm) diameter. Precisely cut to ± 0.039 inches (± 1 mm), the material is always cut, mounted and delivered to the length indicated by the client. The distance between holes is always multiples of 0.650 inches (16.5 mm), so the minimum distance between wheels is 1.299 inches (33 mm). With rimmed wheels, the required minimum distance is 1.949 inches (49.5 mm). The 0.157 inches (4 mm) diameter hole used in the base, eases the later fitting of rivets and screws. |
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