Kratos - 10m Length Helixon-S Retractable Wire Rope Fall Arrest Block 10m10m Length Helixon S Retractable 4. 8mm Wire Rope Fall Arrest Block with Polymer Casing Vertical & Horizontal Use Length 10m (286 1520 24). Casing made up of high impact strength Polymer. Smaller and lighter design. x2 Swivel rotations. Horizontal and vertical use approved. Complete with swivel snap hook at attachment end with built in fall indicator. Equipped with a carrying handle, wire rope brush and a window on the casing which allows easy access