These are NOT reusable once LOCKED. 1 time use ONLY These are TINY. Please verify that you understand the size prior to ordering. 5pcs Link Lock™... It's the fastest, easiest, most secure way to join jewelry without soldering. Make a secure connection in just three (3) easy steps. You can perform this valuable service while your customer waits. Simply grasp the Link Lock™ with a pair of pliers, close the link with a second pair of pliers, then turn the locking flap into position. It's that easy. Dimensions when closedID: 2mm X 3.50mm OD:4.50mm X 5.0mm 20 gauge 0.0853 DWT (0.13 grams) EACH 14k White Gold (RHODIUM PLATED) are listed, item # 153411268642.