Sized 17mm. Consists of a spring section and a stud.
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Prym Sew-On Snap Fasteners Silver 17 mm
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FOUR-PART PRESS STUDS: These s spring press studs comes with 4 part (cap, socket, stud & post). Cap part for fixing socket, socket part (female part
PRYM Small 4GB S Spring Press Studs, 15mm Brass Snap Fastener Matt Black Plastic Cap No-Sew Buttons for Clothing, Wallets, Clutches, Jackets, Handbag