description super duty m13 type 1aa aluminum multi-use ladder for industrial-strength, only one ladder will doâ—the little giant type 1aa. itâ’s government rated to a whopping 375 lb., so you know it can stand up to even the most demanding applications. the type 1aa gives you the advantages of traditional a-frame ladders, extension ladders, stepladders and even scaffoldingâ—all in one convenient package. the little giant is designed to be the safest ladder on the planet and can be used safely on stairs, ramps, curbs, docks or other uneven surfaces. the little giant is made of heavy-wall, 6005-t5 aluminum, the very same material used in aerospace construction. when you buy a little giant, youâ’re getting the world's most versatile ladder system. the m13 has a step ladder height of 3 ft. & adjusts up to 5 ft. in 1 ft. increments. the extension height is 7 ft. & adjusts up to 11 ft. in 1 ft. increments. this ladder stores in 3 ft. 7 in. of space. california proposition 65 warning. specifications acme tools brand name little giant safety acme tools part number 10401w assembled weight (lbs) 5.0 california proposition 65 warning required yes globaltradeitemnumber (gtin) 00096764401009 ladder type multi position package weight 6 package weight (lbs) 6 upc 096764401009