The Extension Ladder is a non-self-supporting portable ladder that is adjustable in length. It consists of two or more sections that travel in guides or brackets so arranged so as to permit length adjustment. It is intended for use by one person.
A Quickstage system is a tubular steel scaffolding structure used mainly in the construction industry, for the support of people and materials. The quickstage system can also be used to prop slabs and formwork.
A Step ladder is a self-supporting portable ladder that is non-adjustable in length, with flat steps and a hinged design for ease of storage. It is intended for use by one person.