Features: The semi automatic adjustment mechanism ensures effortless operations and doubles efficiency, while accuracy depth control ensures consistent countersink holes for professional grades results. Engineered with high hardness alloy construction and special countersink geometry, this drill bit maintains optimal cutting performances across metal, wood, and composite materials. Designed for metalworkers, woodcraft professionals, and serious DIYers requiring exact depth countersinking in fabrication shops or home workshops. Achieve unflawed fastener installations in automotive panels, furniture assembly, and machinery components where flush mounted screws demand millimeter perfect recessing. Integrated depth limiter and quick changes compatibility with standard drill chucks enable seamless conversion between materials without recalibration, maximizing productivity in high volumes drilling operations. Specifications: Component:Alloy Size:As Shown in the Picture Color:Blue/Golden/Red Package Includes: 1Set Semi Auto Adjustable Depth Control Boring Drill Bit note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!