Any rounding off corners Our innovative 6 point flank drive holds onto fasteners and prevents any rounding off corners. This means your fasteners are protected and so are your sockets. Jumbo sockets Jumbo sockets are ideal suitable for fastener applications in settings such as heavy machinery or large trucks. Designed for both pneumatic and electric impact wrenches High-contrast visibility High-contrast visibility permanent laser etched size markings are easy-to-read in low light for easy retrieval & identification Wide range of socket sizes Wide range of socket sizes to fit multiple applications including common Metric socket sizes Stay organized Stay organized with heavy duty blow Metal case for safe keeping when not in use From trucks and tractors to heavy equipment and large machinery, big service and repair jobs need the Stark 1-inch. Drive Shallow Impact Socket Set. Made for use with impact wrenches, these premium industrial sockets deliver superior performance. High-torque, 6-point design contacts and grips the stronger flat sides of fastener head, not the weaker corners, to prevent stripping or round-off under extreme stress Specifications: Type: Socket SetMeasurement Standard: SAEMaterial: Cr-V SteelFlank Type: 6-PointDrive Size: 1"Socket #: 3-1/4, 3-3/8, 3-5/16, 3-1/2, 3-7/8 and 4 inchCarrying Case Included: Yes