FRONT AND SIDES OF PLATEN ARE INSULATED. INSULATION IS WRAPPED IN SHEET METAL. METAL EDGE EXTENDS APPROX .75” TO PROTECT A .75” THICK PIECE OF SURFACE INSULATION (18” X 24” X .75” SURFACE INSULATION NOT INCLUDED). SIX STRIP HEATERS (240 VOLT AND 1200 WATT). OVERALL DIMENSIONS INCLUDING EDGE INSULATION, METAL WRAP AND TERMINAL BOX: 19.25” X 27.25” X 3”. DRILLED/TAPPED HOLES AND SEVERAL THRU-HOLES. APPROX 300 LBS. (QTY. 2). (ITEM #1599)