About ASC Series Slim type with square Head End Cover Cylinder, the bore size has 16mm, 20mm, 25mm, 32mm, 40mm, 50mm, and 63mm etc.7 types. For the acting type, there are basic double acting type, foot type, flange type, single U ring type.etc. fixing types. The cushion way is fixed style (rubber cushion). We also provide I/Y fitting for the end covers.