Easy to use Lockable Snap Posta Poster Frames are suitable for outdoor use and any wall type. Aluminium edges hinges back to quickly insert and change poster and sign contents as needed. Great for fast moving retail, hospitality and advertising boards. Available in standard A4, A3, A2, A1, A0 and custom sizes. Uses security key PFSKEY to release the frame. Non-lockable & indoor versions also available Includes: polyester protector sheet Pet G Replacement Sheet