Meets ASTM F711 and IEC 61478 – Category 2. Designed to effectively position linemen for high-voltage maintenance. Make line repairs possible, even in inaccessible places. Two basic styles of Epoxiglas® Hook Ladders are available: Regular Duty Ladders with 2″ siderails for vertical suspension applications or Heavy-Duty Ladders with 2-1/2″ siderails for tagged-out positions Hooks are formed from 1″-diameter tempered steel.