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"SDS STEP BIT" refers to a specialized type of drill bit combining two features:
SDS Shank: This is a quick-change chuck system (SDS-Plus or SDS-Max) primarily used with rotary hammer drills. The shank has grooves that lock securely into the drill's chuck, allowing for hammering action and easy bit changes without needing a chuck key. SDS drills are essential for drilling into hard materials like concrete, brick, and stone.
Step Drill Bit: This is a conical-shaped bit with progressively larger diameters (steps) along its length. A single step bit can drill multiple hole sizes without needing to change bits. They are primarily designed for drilling clean, burr-free holes in thin sheet metal, plastic, and sometimes wood.
The Key Point: Incompatibility for Hammering
Standard step drill bits are NOT designed for hammer action. They are cutting tools made for metal/plastic/wood. Using a standard step bit in a rotary hammer (SDS drill) set to hammer mode will destroy the bit almost instantly and could damage the drill or cause injury.
Step bits require rotary cutting action only (like a standard drill/driver).
When "SDS STEP BIT" Might Exist (Specialized Application):
Masonry Step Core Bits (Rare): There are specialized core bits designed for drilling large holes in masonry that might have:
An SDS shank.
A slightly stepped profile (e.g., for drilling through pipes embedded in concrete where you need a larger hole on the surface).
Misinterpretation: Sometimes people might see a large masonry bit with an SDS shank and describe its appearance as "stepped," but it's not a true step bit for metal cutting.
Common & Correct Uses:
SDS Bits: Used exclusively with SDS rotary hammers for drilling into masonry/concrete. Common types are:
SDS-Plus Drill Bits (4-12mm typical)
SDS-Max Drill Bits (12mm+)
SDS Chisels (Point, Flat, Scutch)
SDS Core Bits (for large holes)
Step Drill Bits: Used exclusively with standard drills/drivers (NO HAMMER FUNCTION) for drilling clean holes in sheet metal, plastic, and thin wood.
In Summary:
A standard "SDS Step Bit" for cutting metal with hammer action does not exist and is a dangerous misuse of tools.
SDS rotary hammers use specialized masonry drill bits and chisels.
Step drill bits are used only in standard rotary drills/drivers for metal/plastic/wood.
If you need a large hole in masonry, use an SDS core bit with the correct shank (SDS-Plus or SDS-Max).
If you need multiple hole sizes in metal, use a standard step drill bit in a regular drill/driver.