Series 28, crossbars at every link 1.KMA-mounting brackets 2.Mounting brackets, locking or pivoting form 3.R77: Swivel able and removable lid 4.R77: Removable bottom lids 5.Combinable tube and chain 6.Strain relief integratable in AE 7.28/29: Removable crossbars on both sides Inner widths Bi: 1.97 up to 15.75 (50 - 400 mm) Bending radii R: 2.48 up to 11.81 (63 - 300 mm) Pitch: 2.2 (56 mm) per link = 6 links/ft (18/m) When to use Series 28 If a simple system proven for many years is required For zig-zag applications When not to use Series 28 When large unsupported lengths are required in "side-mounted" applications Series 2828 If quiet operation is required Series 280