1.2022AW,2023AW 2024AW closers, which can be installed in the door frame, 2.They have transfered speed valve each from head to foot,both left/right-hand are suitable. 3.2022AW,2023AW 2024AW,The ones that has closing and latching two sections functions. 4.2022AW,2023AW 2024AW door closers are the slippery rail type which are installed,and stopped in the slippery rail. 5.Door device , stopping the angle on the door can be regulated at will. 6.There are two kinds material for conceal door closer,one the aluminum die casting,the other is aluminum alloy cutting