The Main Handle is a rigid handle with a molded grip that has two obvious "notches" designed to fit the J-Hook of most rolling suitcases, including the Luggage Works J-Hook and the Strong Bags J-Hook. The grooves "catch" the J-Hook and keep the BrightLine Bags handle centered on the J-Hook.
If you have a suitcase from the company "Strong Bags", their J-Hook is slightly wider than others (like Luggage Works). This version of the Main Handle J-Hook has been modified to have slightly wider "notches" to allow the J-Hooks from both manufacturers to fit perfectly.
This handle has also been redesigned with many narrow "slots". These slots cause the handle to weigh 40% less. This savings in weight is small, but every ounce (or gram) matters when it's hanging from the end of your arm.
Note: This handle does not include the J-Hook. Some of the photos show a J-Hook just for reference