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Adjustable auto-stop collar controls depth of countersink pilot holes.
Anti-clog debris holes let scraps out easily while drilling.
Auto-stop collar idling at the fixed depth.
Special o-ring protects the workpiece surface.
Sharp, three-flute counterbore.
Parabolic HSS drill bit allows scraps fly out instead of staying in grooves of drills
Drill bit is replaceable.

Strong magnet insides the cover stick screws and avoid dropping during operation.
Automatically separates screws to correct depth and avoid damages to the screw head.
The double-groove design on the hexagonal shank allows you to use it with diversified power tools.

Unique Magic Ribs are added on Star bits to hold screws fitter and evener.
As Anti-Cam-Out Ribs function, Magic Ribs hold torx screws more tightly and less likely to slip.
Formed by forging technology, Magic Ribs tip is more precise to fit screw recess.

An unique innovation using the function of piston to fit different sizes and lengths of Screwdriver bits, Wrench L-key, Screwdriver Handle.