Westward® Ratcheting Box End Wrench Set include wrenches with a spline design allowing numerous fastener head uses. The box end type wrench is suitable for turning nuts that are hard to reach with an open-end wrench. It is made to go around a specific type of nut or bolt with a specific number of sides. It can be adjusted to turn the bolt, even in tight spaces where movement is limited, with less effort. Provides a strong grip around the bolt, whereas bare hands/fingers would simply slip off the bolt. Wrench Sets, Ratcheting Box End Wrench, Reversing No, SAE, Number of Points 12, Insulated No, Number of Pieces 4, Offset 0 Degrees , Head Movement Fixed, Wrench Shape Straight, Wrench Head Sizes 5/16 In., 3/8 In., 7/16 In., 1/2 In., 9/16 In., 5/8 In., 11/16 In., 3/4 In., Full Polish Finish, Standards ASME B107.100-2022, Tether Capable Standard Tool (Accessory Needed for Tethering) This product contains a chemical that is regulated under California Proposition 65. Warning: This product contains a chemical known to the State of California to cause cancer. Warning: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. -