Suitable for craftsmen and consumers. The extension ladder can converted quickly and easily into two single ladders. 2-part ladders shorter than 8 m can be supplemented with a base for extra functionality. Base 2 fits ladders up to 10 m, base 4 fits ladders up to 7 m. Manufactured of aluminium. Practical accessories: base, extension leg, top support, movable step plate, top wheel, reversible stud, hinged slide guard. Type controlled.