description werner aero extension ladder 28' type iaa fiberglass box rail/tri rung the 28ft aero lightweight fiberglass extension ladder model b7128-2 boasts a duty rating of 375lb and features exclusive boxlock鈩?interlocking rail technology. the patented box rail design provides the ultimate climbing experience reducing bounce, twist, and side sway compared to other lightweight ladders on the market. the aero lightweight extension ladder is 25% lighter than our standard 375lb rated ladder increasing productivity and reducing fatigue. the traction-tred庐 tri-rungs are slip-resistant and provide a wide flat standing surface. fiberglass rails are non-conductive for working near electricity. california proposition 65 warning. features lightweight - 25% lighter than standard 375lb extension ladders boxlock鈩?interlocking rail system reduces deflection, twist and sway for a more confident climbing experience. solid feel = more confidence reduced bounce, twist and sway combined with wide rungs for premium climbing comfort. 19鈥?wide clear width for stability 1.625 inch slip-resistant traction-tred庐 tri-rungs rugged, heavy-duty extruded rung locks are spring-loaded to operate smoothly durable rail shield and shoe bracket protects rail from damage dual-action feet with slip-resistant pad and spur plate for use on hard or penetrable surfaces mar-resistant traction caps鈩?specifications acme tools brand name werner acme tools part number b7128-2 ansi ladder rating type iaa assembled weight (lbs) 50.1 base spread (in) 18.5 base width (in) 18.5 country of origin mexico duty rating (lbs) 375.0 globaltradeitemnumber (gtin) 00051751141597 ladder length (ft) 28 ladder material fiberglass / aluminum ladder type extension package contents 28ft aero type iaa fiberglass box rail/tri-rung extension ladder b7128-2 package depth 336 package height 3.5 package weight 50.1 rung/step depth (in) 1.625 rung/step material aluminum telescoping no upc 051751141597 weather resistance yes weather resistant yes