Fitted with friction hinges and quick-locking handles. The handles and hinges leave the lens clear of obstructions, giving it an uncluttered view and clean modern look.. CE-approved for areas 1B and 2A.To be installed on 9-mm to 30-mm thick surfaces. Supplied with 20 x M5 studs for 17/2-mm thick surfaces. ABS internal trimming ring (chromed for size 8) and removable flyscreen.