Specification: Product Name: Countersink Drill Bit Set Material: Steel Color: Black Red Countersink Drill Bit: 70x2.8x8mm/2.76x0.11x0.32 inch, 70x3x8mm/2.76x0.12x0.32 inch, 70x3.2x8mm/2.76x0.13x0.32 inch, 70x3.5x8mm/2.76x0.14x0.32 inch, 70x4x8mm/2.76x0.16x0.32 inch Hex Shank: 1/4 inch Description Adjustable Depth Ring: The bit features an adjustable depth stop ring that allows precise control of drilling depth. Whether it is to set the screw head flush with the surfacing or to drill to a specific depth, the stop ring can be adjusted for increased project accuracy Ease of Installation: Each drill bit comes with hex wrench, simplifying installation and supporting quick adjustments as needed. This not only saves time, but also improves work efficiency, especially useful when bits need to be changed or adjusted frequently Multiple Sizes: Available in 2.8x8mm, 3x8mm, 3.2x8mm, 3.5x8mm and 4x8mm sizes. Also comes with a clamp head and a screw bit for a variety of woodworking drilling and countersinking requirements Steel Material: The drill bit is made of steel, which is sturdy and resistant to easy breakage and deformation, making it ideal for demanding woodworking tasks and ensuring that the drill bit remains in good working condition under intensive use Hex Shank: Equipped with a 1/4 inch hex shank, the drill bit is compatible with electric drills and quick change clamp heads. This design ensures that the drill bit can be easily and securely held in a variety of applications, increasing flexibility and ease of use Parts List: 5 x Countersink Drill Bits 1 x Clamp Head 1 x Screw Bit 4 x Wrench 1 x Plastic Storage Box