Kratos - 3.5m Length Helixon-S Retractable Webbing Fall Arrest Block 3.5m3. 5m Length Helixon S Retractable 25mm Webbing Fall Arrest Block with Polymer Casing For Vertical & Horizontal Use 3. 5m Length (SKU 286 1520 43). High impact resistant polymer casing. x2 Swivel rotations. Smaller and lighter design. This Kratos Helixon S Fall Arrest Block is Horizontal and Vertical use approved. Complete with swivel snap hook with load indicator at attachment end and karabiner at anchorage end. Equipped with a carrying handle, wire