Total HSS drill bit diameter:16mm 5pcs

a common Multi-Purpose Articulated Folding Ladder. It’s a robust and extremely versatile option for both professionals and heavy-duty home use.

The specification “$4 times 5text{M} (5.7text{M})$” means:

• $4 times 5$ (Configuration): The ladder has 4 folding sections, with 5 steps/rungs on each section, giving a total of 20 steps.¹

   

• $5.7text{M}$ (Maximum Length): This is the approximate length when the ladder is fully unfolded into a single, straight extension ladder.²