Description
[C-profile design] Step drills feature a triple-flute design for increased stability, effectively addressing deviation issues during the cutting process. Additionally, the C-profile cutting edge ensures smoother cutting and a 2X increase in cutting speed.
[Coating] Step drill bits coated with aluminum titanium nitride, rated at 89HRC for exceptional hardness and thermal properties. This coating provides superior resistance to heat, wear, and corrosion, with high adhesion and low friction. Laboratory tests show it is more durable than steam-treated black oxide coating for extended drill bit life.
[15 step sizes] Spiral flute design, with 15 distinct steps from 4 to 32 mm, provides seamless and efficient drilling across different thicknesses, eliminating the need for multiple drill bits. Includes 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 32 mm.
[M35 HSS step drill bit] M35 cobalt high-speed steel achieves high levels of hardness and wear resistance through appropriate heat treatment. Its toughness and bending strength surpass those of standard high-speed steel, making this step drill bit more suitable for cutting harder materials, such as mild steel, medium hardness steel, stainless steel.

Color: Black
Material: steel
Note: The color and style of the bag are random in different batches and cannot be specified.

Package contents:
3 pcs. step drill bits for metal (4-12 mm 4-20 mm 4-32 mm)

Only the above package content, other products are not included.
Note: Light reflection and different displays may cause the color of the item in the picture to be a little different from the real thing. The measurement allowed error is +/- 1-3 cm.