Saftron SB-F-G 6" Gray Surface Mounting Anchor Flange, Polymer. Saftron 6″ Polymer Bases are used to secure all 1.90″ OD pool and spa rails, ladders, and safety railing. Bases surface mount to any secure anchoring foundation. A high impact polymer exterior ensures Saftron products are unaffected by pool chemicals, salt, and sun and remain cooler to the touch.