Description Features: Perfect for pre-drilling holes for nails or screws to avoid splitting the material Their trapezoidal design creates a tighter grip between the workpiece and the fastener Made from high-grade carbon tool steel – maintains sharpness for a long time Compatible with both standard and impact drivers Specifications: ⌀ Length Spiral Length 3 mm 110 mm 45 mm 4 mm 125 mm 60 mm 5 mm 135 mm 70 mm Shaft: 6.35 mm hexagonal Maintenance: We recommend regularly cleaning the drill bits from residue, lubricating with vegetable-based oil to prevent corrosion, and storing in a dry place (steel is susceptible to rust) Tips: For pre-drilling holes for wood screws: Select a bit roughly 70-80% of the screw’s thickness for the best grip (e.g., 4 mm screw = 3 mm bit). Drill to a depth of 1/2 to 2/3 of the screw length. Made in Japan
