Our crochet pins are oil-free, keeping your crochet knitting project clean and tidy. 304 stainless steel composition: Made of high-grade 304 stainless steel, our needles are used to prevent non rusty stitches in woven stainless steel. These pins are sturdy and long-lasting. They can withstand bending and breakage even under repeated use and external pressure, making them reliable accessories for crochet weaving. [ Accurate Size Compatibility ] Featuring a standard diameter of 3mm and a standard diameter of 6 inches, including 50 stainless steel pins, perfectly tailored for most crochet boards with 3mm holes. Each pin perfectly fits the plate hole, providing stable and reliable support for your Granny square cover plate project. Smooth design: Carefully polished to achieve a smooth effect, ensuring a smooth production experience and helping you maintain the cleanliness and beauty of crochet weaving. These stainless steel pins can improve your work efficiency and project quality, making them the perfect complement to your crochet tool kit. Please note that this package only includes stainless steel pins and does not include crochet cover plates.