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Locking pin backs with precise sizing: The pin hole measures approximately 1mm in diameter, the top diameter is around 10mm, the base diameter is about 7mm, and the overall height is roughly 7mm — a compact profile that fits standard pins securely. Strong brass build with silver finish: Crafted from solid brass and plated with a silver-coloured coating, these pin backs deliver exceptional strength, resist corrosion, and offer long-lasting durability for everyday wear. Tool-free spring-loaded fastener: The spring mechanism makes attachment and removal effortless — just push to lock the pin, press the base to fix it firmly, and pull to release the lock. No extra tools needed. Versatile for countless DIY projects: Great for badges, flaps, jewellery making, display books, cords, bags, jackets, lanyards, vests, hats, and more. Keep all your accessories and craft items firmly in place. Reliable for hanging needs: Ideal for securely hanging house keys, posters, wedding photos, framed maps, postcards, and similar lightweight items — the locking design helps prevent accidental slips and falls.