The Vax M33-ACL 3-InLine Acoustic Machine Head is a set of three precision tuning pegs aligned in a single row designed for acoustic guitars, offering reliable pitch control and smooth tuning adjustments. Built with durable metal housings and geared mechanisms, these machine heads provide stable tuning performance and are ideal for replacing worn or stock tuners to improve tuning accuracy and playability on steel-string acoustic instruments. The inline configuration suits guitars with three pegs per side on the headstock, and the set typically includes mounting hardware for straightforward installation. While exact specs vary by model, these tuners generally balance durability, ease of use, and consistent tuning stability for acoustic players looking to upgrade their guitar’s hardware.