CRAFTSMAN Impact Socket Set, Metric, 3/8-Inch, 9-Piece (CMMT15881) 9-piece 3/8-inch Metric Deep Impact Socket Set is engineered and constructed to endure high torque application with impact wrenches and impact sockets 3/8 drive. These impact metric sockets are specially designed to engage with the flats of fasteners to prevent rounding so it's time to turn up the torque and turn tough jobs into easy ones. Features CORROSION RESISTANCE: Socket set has black oxide finish INCREASED TORQUE: 6-point mechanic socket set with fastener QUICK SIZE IDENTIFICATION: Metric socket set 3/8 inch drive comes with large markings Meets or Exceeds ASME Specifications Full Lifetime Warranty, refer to "Warranty Support" section below for full details 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.