Bigger and heavier for most aluminum and fiberglass ladders, from Type 3 to Type 1AA. Made for professionals and perfect for the everyday handyman. The Ladder-Aide is the quickest, easiest and safest way to use your extension and combination ladders on stairs. It is a compact and portable unit that does not require permanent installation on your ladder, can easily be moved from stair to stair and can be used with a variety of ladders. With an anti-skid surface and micro-adjustable height (to within 1/8 inch), it creates a stable, level base for use on stairways. It is rugged construction of high-grade aluminum and steel and heavy-duty design mean it is built to last.