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Package: 40 Pieces pin keeper lock. 40 Pieces tacks. a storage box.Keep your lock pins safe. Size:10mm (0.39")in diameter,6mm (0.24") in height;8mm Length TacksNo tool required: easy on-off action, spring loaded fastener simply need you to push to lock them, then push on the base to secure them and pull to loosen the lock and removeSafe alternative to the old screw/wrench locking mechanism; never bend or break another post again.Multifunctional:Blank pins and clutch back can be applied to make tie tacks,display books, badge insignia, name tags,lanyards,citation bars, bags, vests, hats,service bars and jewelry making, etc.Good quality: pin backs locking clasps are made of nickel-plated copper, durable, smooth surface, sturdy and lock your pins firmly to keep them secure