Brand: Snap‑on
• Model/Part: PSA18E (½″ drive / 9/16″ hex). The catalog lists: “1/2″ Drive SAE 9/16″ Power Hex Socket Driver” for this part. 
• Drive: ½″ square drive
• Hex / Bit size: 9/16″.
• Length: approximately 1¾″ see photos
• Finish: Black-oxide / industrial finish (catalog states: “industrial, black-oxide, finish helps protect against corrosion”). Although these show some oxidation as you can see in the pictures.
• Condition: Used; shows slight discoloration (surface oxidation) but fully functional (drive end and hex end intact, no evident damage beyond cosmetic).
• Origin: Made in USA
• Usage spec: Designed for power/impact applications (catalog indicates Power Hex Socket Driver”