Eliminates uneven ground. Easy to use, adjust 3/8" increments up to 8-1/4". Convenient, built in bubble level. Dual action foot for use on hard or penetrable surfaces. Lightweight aluminum. Exclusive Alflo Twist-Proof performance. Slip-resistant steps andrugged locks. Reaches areas of the home that traditional ladders cannot. Dimensions: rails 3-5/16" wide, rungs 1-1/2", base widths 17-3/4" outside shoes, flange 1-3/16" wide and fly width 15-1/8" outside rails. Length of extension ladders when not extended is half the total length of the sections.