Easy to use. Allow you to change your blades quick and easy during fishing. Size: 0.47"/12mm. Fits all types of fishing lines. Premium plastic material protects your fishing better than metal ones. Good for most kinds of blade. Ensures all-round free spin for your blades. Effectively reduces blade lost rate. No more re-tying. A must-have to add to your spinner making kit for walleye rigs, Alabama rigs and many others. 100pcs per pack huge quantity.