ARMSTRONG RIB Ladder 3-Step & 4-Step

Model# 3 Step: RL3-37N-SM, MD, LG, XL ; 4 Step: RL4-48N-SM, MD, LG, XL ARMSTRONG RIB Ladder 3-Step 37" & 4-Step 48" For 3 Steps (37" Length): Small: Designed for tubes with a diameter of 16"-18" Medium: Designed for tubes 19"-20" in diameter Large: Designed for tubes 21"-22" in diameter Extra-Large: Designed for tubes 23"-24" in diameter For 4 Steps (48" Length): Small: Designed for tubes 16"-18"