Core Function: 3pcs spiral fluted HSS step drill bit set, designed for drilling, reaming and chamfering multiple hole sizes in metal, wood and plastic. Covers 4-32mm range for versatile applications.

Material & Craft: Made of high-speed steel with black oxide anti-rust coating, high hardness and wear resistance; spiral flutes ensure smooth chip removal; precision ground cutting edges for clean, burr-free holes.

Structure Design: Triangular shank prevents slipping in drill chucks; multi-step design allows multiple hole sizes with one bit; spiral flutes reduce cutting resistance and improve heat dissipation.

Specification: 3pcs set includes: 4-12mm, 4-20mm, 4-32mm step drill bits with different shank sizes.

Use Advantage: Eliminates frequent bit changes; works on stainless steel, iron and aluminum sheets; smooth spiral flutes reduce clogging; triangular shank fits most power drills; durable black oxide finish.

Application: Sheet metal drilling, stainless steel hole enlarging, plumbing installation, wood/plastic drilling and deburring.

Detail Design: Anti-slip triangular shank; spiral chip flutes; rust-proof black coating; multi-step hole sizes; sharp precision ground edges.

What's in the box
3 x HSS Spiral Flute Step Drill Bit