The main benefit to an adjustable spanner is the incredible convenience of just having to use one tool for the entire process; there is no need to switch out tools or carry around a massive group of them whenever you've got a job to do.
Material: Carbon steel
Application: Used to loosen or tighten a nut or bolt.
Features & Benefits: The convenience of just having to use one tool for the entire process. Phosphated black finished. Hardened and tempered.