Louisville Ladder Pro Grip 16 ft. medium duty aluminum 2-section D-rung extension ladder. Medium duty yet light weight. Designed for a 225 pound workload when set at the proper working angle. Modified I-beam, side rails are full 3" extrusions shaped into a modified I-beam for strength and light weight. Interlocking rails keep fly and base sections from coming apart. Swivel safety shoes, heavy duty plated steel shoes with thick rubber tread. Exclusive Louisville Ladder design. Full swivel safety shoes can be used with tread down or in spike position. Quick latch equipped rung lock and one-finger operation provides easier method of securing fly and base sections when extended.