This product is a vintage Diamond Tools 5-1/2" slip joint pliers with the manufacturer part number K15. Made in Duluth, USA, this single item hand tool is a quality product from a reputable brand. The slip joint design and knurled handles allow for easy grip and precise handling, making it a versatile tool for various tasks. With free shipping and handling included, this item is a great addition to any collection of vintage tools or automotive supplies.

Very good overall, used condition. Shows expected signs of age and use with scuffs, scratches, and some stains noted. No significant flaws found. Functions as intended. Joint seems tight and jaws in good shape as well. Stamped markings are very clean and legible: "K-15 DIAMOND DULUTH" and cast in handles "FORGED IN U.S.A." Chrome finish. Measures approx. 5-1/2" long. 

Please see photos, I try and capture the good, the bad, and the ugly with close-up images.  

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Reasonable offers considered and appreciated. Thanks for looking, reading, and buying!