Providing & fixing T-iron frames for doors, windows and ventilators of mild steel Tee- sections, joints mitered and welded with 15x3mm lugs, 10cm long embedded in cement concrete blocks 15x10x10 cm of 1:3:6 or with wooden plugs and screws or with dash fastener or rawl plugs and screws or with fixing clips or with bolts and nuts as required including fixing of necessary butt hinges and screws and applying a priming coat of approved steel primer.