Louisville Ladder AE3240 Aluminum Extension Ladder 250-Pound Capacity, 40-Feet 250 pound capacity including user and tool weight Meets or exceeds the safety standards set by ANSI (American National Standards Institute) and OSHA (Occupational Safety and Health Administration) Modified I-Beam, side rails are full 3" extrusions shaped into a modified I-beam for strength and light weight, interlocking rails Swivel safety shoe, heavy duty plated steel shoes with thick rubber tread, shoe can be used with tread down or in spike position QuickLatch equipped runglock provides easier method of securing fly base sections when extended, one finger operation