The line of 3/8 inch sockets of 3/8 in.Dr 12 Point; Spline Size: 12,14,16,18,20 ; SAE Size: 3/8, 7/16,1/2,9/16 is used primarily for automotive maintenance and general mechanical work where there is not a lot of work space available and the torque requirements are not very high. They have the following ranges of application: Socket opening size: 1/4 inch to 1 inch and 6-26 mm. Torque applications for sockets, handles, and accessories: 270-2200 in-lbs.The line of 3/8 inch sockets is used primarily for automotive maintenance and general mechanical work where there is not a lot of work space available and the torque requirements are not very high. They have the following ranges of application: Socket opening size: 1/4 inch to 1 inch and 6-26 mm. Torque applications for sockets, handles, and accessories: 270-2200 in-lbs.