17.5" x 18" interior 2-1/2 inch brick Dyna-Glow Hard Ceramic Element Holders makes it super-easy to change elements Cone 10 Operation (for most models) Hi-Medium-Low Switches - switches & elements last longer Externally Mounted Orton Kiln Sitter/Timer - away from heat Easy-to-remove Control Panel: easy to repair by anyone with a screw driver and a wrench MANY STANDARD FEATURES: Other features include heavy-duty corrosion free stand, hinge, case and screws, 800 number technical support, sectional construction for easy moving and set up, visual instruction manual, and power cords for all models