The Link-Belt 145 X4 Spin Ace is a hydraulic excavator in the Link-Belt X4 series, designed for general excavation, utility work, site preparation, and material handling. It features a compact tail swing configuration for improved maneuverability in confined job sites and is commonly used in urban construction, roadwork, and landscaping applications. The machine is equipped with a diesel engine, hydraulic system, and operator cab designed for productivity and visibility. As part of the Spin Ace lineup, the 145 X4 is associated with reduced tail swing operation and efficient digging performance. It is classified as an excavator for construction and earthmoving use.