Friction Post Diameter 0.90 mm x 11.0 mm by PERRIN Sale $1.47 | / SKU 40-28-509 1 2 3 4 5 6 7 8 9 10+ Quantity Chevron down icon Quantity Add to cart Spinner icon Notify me when back in stock Email address Email me when available Friction Post Diameter 0.90 mm x 11.0 mm is a heavy friction post available in sterling silver only. These posts measure 11 mm x 0.90 mm. Friction post are also referred to as straight posts.