Exposed surfaces are generally textured to produce a range of effects, typically: acid etching/surface retarding; rubbing; grit blasting; bush hammering; and grinding and polishing. False joints and ...

Polished stems have an Ra of 2 to 5 micro-inches; matte finish stems, approximately 15 to 40 micro-inches; and grit blast stems, approximately 80 to 120 micro-inches.