... and latching can be adjusted.(3)When the door open to 65 degree,the door closer have back check function,and the function ... be adjusted.(5)The power of closing door can be adjusted.(6)Vertical on the door,vertical on the doorframe,parallel and sliding ... is adjustable,backcheck,delayactionSL4000(heavy duty)29747571928060kg~150kg≤1200 Automatic door closer SL4000,25~150kgs,big body series