Half-cylinder Caulking Gun 1.Mainly used to metal, fiber, leather, plastic and glass. 2.High quality steel body and zinc all Half-cylinder Silicon sealant Gun 1.Mainly used to metal, fiber, leather, plastic and glass.2.High quality steel body and zinc alloy handle.3.High quality powder metal spanner allow to extrude hi-viscosity glue.4.Size:225mm/9" Half-cylinder Silicon sealant Gun COC015