Sufficient quantity: package includes 100 pieces strews and 10 pieces locking tools wrench, full sized slim profile sets are provided to meet all needsDurable and exquisite:the locking backs are made of -plated copper, rendering them completely rustproof, and extremely durable.Size information: the pin keeper diameter is 6 mm/ 0.24 inch, the height is 5 mm/ 0.2 inch, and the screw length is 3 mm/ 0.12 inch, sufficient to lock the pins firmly in place; The locking tool is 4.5 cm/ 1.8 inchesKeep your pin in place: you won"t have to worry about pins falling off or losing them, the locking pin keepers will secure pins on leather, vest, jacket, cap, hat, work uniform, lanyard, bags, cards, and virtually any garmentEasy to attach: just put a pin keeper in the back of your favorite pin, then use the looking tool to secure it in place, the whole process is quick and effortless, and a boon to those who love to sport pins