The DELOCK 50 Port Blocker (Item No: 20963) is a reload/wholesale package with 50 physical port blockers for standard female USB Type-A ports. Installation is by pressure, so it physically blocks the insertion of USB cables or sticks. Removal requires the Delock removal tool from Item No: 20648 (not included). Color: white. Packaged in a resealable bag. Its purpose is to secure unattended devices, such as computers, laptops, and kiosks, by preventing unauthorized access via USB.