Pin Backs for Lapel, Brooch, Tie, Hat, Badge Insignia, Name Tag, Jewelries Features: Rubber pin backs made of high quality pvc rubber Pin backings lock your pins firmly and securely Pins locking backs compatible with pins 1-1.2mm in thickness Pin clutch backs great for most lapel pins, tie tacks, badge insignia, citation bars, jewelry,etc. Specification: Diameter: 11mm Height: 7mm Warm Tips: 1)The size above is measured by hand, the size of the actual item you received could be slightly different. 2)Pin backs locking are small and tiny accessories, please keep them away from children under 3 years old and your pets as well. Package Includes: 50PCS Rubber Pin Backs