... and latching can be adjusted.(3)When the door open to 65 degree,the door closer have back check function,and the function ... selected.(7)Can match with all kinds of metal line cover(Plating chromium,nickel,titanium and wire drawing)(8)The finished ... is adjustable,backcheck,delayactionSL4000(heavy duty)29747571928060kg~150kg≤1200 Automatic door closer SL4000,25~150kgs,big body series