Caulking Gun , Material : steel ; Purpose : architecture . Caulking Gun ,Specifications:1. Material : steel parallel frame,reinforced plastic material ;2. Thickness of skeleton:1.2mm,1.8mm,2.0mm ;3. Inside frame length: 9" ;3. CNTS : 40pcs ;Best quality and competitive price . Caulking Gun ( SX-TM-818 )