Hexagonal rod design & Non lubrication Cylinder with hexagonal rod design enables non-rotation of rod. Special housing and bushing enables self lubrication of piston rod. High quality long service life Hard anodised aluminium cylinder tubes offer a high resistance to corrosion and low internal friction. ISO-VDMA standard specification Conforms to ISO-6431 and VDMA 24562 specification enabling worldwide interchangeability. Easy to insert reed switch With four grooves on the tube, proximity and reed sensors can be easily inserted into any position.