Apex female spline sockets are manufactured using a proprietary steel and heat treat process that yields greater strength and a longer bit life. The cutting-edge machining process used to manufacture Apex female spline sockets results in tighter tolerances, superior product consistency and a better and more consistent fit to fasteners leading to better torque transfer.Apex female spline sockets are recognized as the industry leader in professional tooling throughout the aviation industry as well as automotive, heavy industry or anywhere quality tooling products are required. If you have invested money in quality tools, you need to know that your female spline sockets will deliver the performance you require of them. Apex manufactures female spline sockets for the aerospace, automotive and other industries where reliability is key. Day in and day out, you will find Apex female spline sockets hard at work in some of the worlds busiest manufacturing facilities.