CRAFTSMAN V-SERIES Socket Set, Hex MM, 3/8 Inch Drive, 6 Piece (CMMT17720V) Manufactured for professional-level performance, the V-Series 3/8 in. Drive Metric X-Tract Technology Hex Bit Socket Set features an innovative fastener gripping design. Built with X-Tract Technology, these hex bit sockets are geometrically designed to extract fasteners that are up to 50% rounded without inflicting damage to the fastener. Ideal for everyday use, they are also designed to prevent future rounding when tightening and loosening fasteners. Features HELPS PREVENT ROUNDING AND STRIPPING of new fasteners with X-Tract Technology MULTI-APPLICATION VERSATILITY: Dual-use design for utility on rounded and un-rounded fasteners HIGH DURABILITY FOR LONG LIFE: Full-polish chrome helps resist rust and corrosion BACKED BY A LIFETIME WARRANTY: Designed to deliver the quality and durability expected from the CRAFTSMAN brand - if the product fails to perform,we will replace it USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.