Automatic door closer SL4000 Suitable door weight: 25~150kgs Suitable door ... )When the door open to 65 degree,the door closer have back check function,and the function can be ... to 65 degree,and the function can be adjusted.(5)The power of closing door can be adjusted.(6 ... adjustable,backcheck,delayactionSL4000(heavy duty)29747571928060kg~150kg≤1200 Automatic door closer SL4000,25~150kgs,big body series