All floor springs have passed 300,000 times opening and closing tests,meeting safe application standards. KT84 floor springsLoading weight: 130-160KGS90 Hold and Non-Hold functiondoor size:1300mm*2300mmused for all metal ,steel or plastic doorsdoor openning angel at 116 degree at your optionbase size: 322*130*43mmCan also offer Dorma type KT84 floor spring