High Quality:Made of high-quality ABS plastic material, the product can be used for a long time, but still has good color luster and high visibility. Applicable Size:The inner hole size of the magnetic lock is 6 mm (0.236 inches), suitable for hooks of 4.5-5.9 mm (0.178-0.23 inches). This product is black. If several styles of different colors are applied together in the store, the different products in the store can be easily distinguished only by the color of the lock. Easy to Use:The small and exquisite style is very convenient for storage. Attach the magnetic unlocker to the bottom of the magnetic lock and you can unlock it quickly and easily. (Unlocker not included, needs to be purchased separately) High Security:Customers cannot take out items from the hook without the permission of the clerk. The magnetic lock with "STOP LOCK" pattern makes your store more secure and reduces personnel management costs. Wide Application:The anti-theft lock can be widely used in retail stores, bookstores, pharmacies, auto parts stores, shopping centers to display earphones, batteries, books, molds and other products. When the clerk picks up the goods, he can also remind the clerk to replenish the goods. Name: Hook Lock Hole inner diameter: 6mm/0.236 inch Size: 40 x 20mm/1.6 inch x 0.8 inch Colour:Red / black Material:plastic<br><br>Package Contents: 100 * Anti-Theft Locks Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.