... Tolerance: +0.0, -0.1mm Thickness Tolerance: +/-0.05mm Glass tube(Glass Washer) We could according to you requirement design and ... make many kinds of tube products. Specifications: Material:B270, BK7, Fused silica etc glassDimension Tolerance ... .25mm X 45°Coating:Upon requirement Optical BK7, fused silica tube, quartz glass tube, glass washer