The D6016-2 16 feet fiberglass extension ladders have non-conductive side rails and a duty rating of 250 lbs. The Traction-Tred D rungs are slip resistant and the side rails are interlocking. The rail shields protect the bottom of the rail and the Shu-Lok shoe pivots easily for use on hard or penetrable surfaces. The exclusive Alflo rung joint guarantees Twist-Proof performance. Exclusive Alflo rung joint means Twist-Proof performance1-1/2 inch slip-resistant Traction-Tred D-rungsDurable extruded rung locks are spring loaded to operate smoothlyMar-resistant molded end capsInterlocking side rails with internal rail guides on bottom of fly section securely connect railsInternal guides on bottom of fly section securely interlock railsExternal guides at top of base section securely interlock railsCombination rail shield bracket and shoe with Shu-Lok and slip-resistant padMolded rung braces on bottom step for increases durability