The GripEdge Tools 7-pc 3/8" Drive Short Metric RPT Hex Driver Set, No. GE7BSMHSRPT, are designed to replace traditional hex tools and prevent damaging and rounding of Hex fasteners. Sizes included in this set are 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm. The patented bi-directional enables the loosening and tightening of new and damaged Hex fasteners. Made with S2 steel for increased stregnth and durability. The oversized roll stamping and ink-filled size marking increase visibility.