This tool is used to apply glue. Its slightly heavy weight makes it easy to hold steadily, and the metal construction allows for easy removal of glue. Of the three sizes, I often use the W-164 mm spatula shown in the image. An alternative tool is a toothpick.

Product Data
Website: Unknown Brand Page
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Brand: YFFSFDC
Product Number: B08LR4Q1F2
Size: W-173, 175, 164 mm
Weight: 65 g