VIZ-PRO Tamperproof Lockable Noticeboard Class 1 Aluminium Framed 36x24 Inches Aluminium frame board, blue felt backing Overall size: 36" x 24" ( frame included); Lockable surface size: 34" x 22" Supplied with two keys for the lock Internal depth up to 3/5 inches Acrylic cover. Use water or mild soapy water to clean surface. DO NOT use any "Glass cleaning liquid solutions", it may causing surface damaging permanently