9'' Three Rod Heavy Duty Caulking Gun: 1.Size:9 inch; 2.Material:carbon steel, aluminum handle; 3.centre rod diameter:7.8mm. 9'' Three Rod ... Heavy Duty Caulking Gun:1.Size:9 inch;2.Material:carbon steel ... carbon steel push rod,zinc plated,DIA:7.8mm,aluminum handle,aluminum trigger;4.Weight:750+/-10g. 9'' Three Rod Heavy Duty Caulking ...