20PCS Locking Pin Back Locking Pin Keeper Clasp, Metal Pin... It only takes two simple steps to fix the Pin lock PACKAGE CONTENTS: Set of 20 pin keepers with locking mechanism and 2 wrenches for secure fastening of enamel pins, lapel pins, and jewelry findings... The set includes 20 metal locking backs plus 2 handy wrenches that make installation and removal super easy. The locking mechanism is seriously secure - once... 5., 0 out of 5 stars Best Sellers Rank #580,267 in Arts, Crafts & Sewing (See Top 100 in Arts, Crafts & Sewing) It only takes two simple steps to fix the Pin lock, Material: Metal , Size: 6 x 5., 5 mm (Dia x H) 20 Pcs Pin Keepers Pin Locks Enamel Pin Locking Backings Replacement Locking Pin Backs Clasps with 2 Pcs Wrench for Enamel Lapel Pins Backs Pin Locks For Enamel Pins EuTengHao 30 Pieces Pin Locks Pin Backs Locking Pin Backs... Locking Pin Backs For Enamel Pins Suitable for locking the back of the pin