This 3/8" Stop Collar Hex Shank Twist Step Drill Bit Wrench is designed for use with Kreg Pocket Hole Jig. Made from high carbon steel, it features a hexagon pattern and a length of 160mm. The front diameter is about 4.3mm, and the step drill material is high speed steel. This unbranded/generic product is manufactured in China and has a shank diameter of about 9.5mm. Perfect for woodworking and metalworking projects, this drill bit ensures precision and efficiency in drilling tasks.