Spindle lock nut wrench, specifically designed for removing and installing spindle nuts on various vehicles. • Function:It's used to access and manipulate spindle nuts located within the hub assembly, which are crucial for wheel repairs, suspension work, or brake replacements. • Design:This particular wrench appears to be a 4-lug design, suitable for certain 4WD vehicles like 1/2 and 3/4 ton trucks, including some Ford models with Dana axles • Usage:It is typically used with a 1/2-inch square drive tool, such as a torque wrench, ratchet, or breaker bar.