a security product display hook assembly comprising a unique form of product display hook , in combination with a security lock , providing optional levels of product security and customer convenience . the display hook has a merchandise supporting arm formed with a back section , an intermediate section and a front section . the intermediate section is of sharply irregular configuration to allow , but inhibit , product removal , while effectively preventing mass product removal often attempted by shoplifters . the locking device is positionable in front of or directly behind the intermediate section to provide the highest security , with all products locked or an intermediate level , with a portion of the products locked . the locking device can also be positioned at the back of the back section such that all products are unlocked and available for customer selection .