Makita High-Speed Steel Step Drill Bit 4-20 mm Diameter, Tin Coated, Hex Shank 0.25in D-40129

Makita D-40129 specialist HSS step drill bit with 4-20 mm diameter range and 1/4 inch hex shank is engineered for professional use in metalworking and precision drilling applications. The bit's conical step design simplifies hole enlargement, enabling multiple hole sizes from a single tool, saving time and reducing tool changes.

The titanium nitride (TiN) coating extends tool life by enhancing hardness and reducing friction during drilling operations, particularly useful in high-speed scenarios. The straight flute design improves chip removal, yielding cleaner holes and preventing clogging.

It is suitable for a variety of industrial uses including automation systems, electronic assemblies, mechanical fabrication, and maintenance tasks. The drill bit efficiently works on both ferrous and non-ferrous metals and is especially effective when enlarging holes in sheet metal or creating precision openings in electrical enclosures.

With a 0.25-inch hex shank, it fits securely in most standard power drills, ensuring versatility and ease of use in workshop environments. The product is manufactured in China to Makita's quality specifications to maintain consistent performance and reliability.

Durable HSS material construction for long service life. Tin-coated step drill bit reduces wear during repetitive drilling. Measures holes from 4 mm to 20 mm in diameter with nine distinct steps. Compatible with standard drills due to hexagonal shank design.

Ideal for professional industrial, manufacturing, and maintenance applications. Efficient chip removal design for smooth drilling operations. Suitable for both ferrous and non-ferrous metal drilling requirements. Manufactured under Makita brand quality with controlled standards.

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