standard

Step Drill Bit Sizes (Typical Range Chart)

This page provides standardized, specification-oriented reference information.

Specifications

Specification	Value
Common Ranges	1/8–1/2 in; 3/16–3/4 in; some sets extend to 1-3/8 in (varies by product).
Step Increments	Often 1/16 in (imperial) or 1mm/2mm (metric), depending on bit design.
Best For	Thin sheet metal, plastics; deburring and enlarging holes.

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Last updated: February 23, 2026