CM-1230-HSL (Material:Stainless steel body,stainless case) ♣ This kind of door closer is fit for plane door.It can close the door tightly in 3-4 seconds . It can prevent the cold air leaking,and close door quietly. ♣ The structure is hydraulic,the cylinder is filled with cold-resistant hydraulic oil.You can open door freely eventhough outdoor temperature is below -20°C. ♣ CM-1230-HSL opening strength : 8kgs, closing strength :5.5kgs. ♣ The case and bracket's material are all 304# stainless steel. ♣ Remark: with 7 pcs self-tapping screws attached.