12-Piece Open End & Box End Ratcheting Wrench Set - Metric & SAEThis versatile wrench set can be used for various applications. The open-end wrench side allows users to ratchet nuts or bolts on or off without removing the wrench from the fastener. The box-end side of the wrench is an option for applying more torque when necessary.Features:The open-end ratcheting feature allows users to fit in tight spaces with speed The chamfering shape helps with easier fit into fastenerAntislip design provides gripUnique engaging surface protects fastenersSpecifications:Size: Inch: 3/8, 7/16, 1/2, 9/16, 5/8, 3/4-in. / mm: 10, 12, 13, 15, 17, 18-mm