If you want one drill-bit kit that handles common hole-enlarging and finishing tasks without swapping between multiple sets, the OSTTE 11PC Step & Countersink Drill Bit Set is built to simplify your workflow. It combines 5 step drill bits, 5 countersink bits, and a center punch, covering more than 50 sizes from 1/8” to 1-3/8”.
You can view the current price and full details on Amazon here.
The bits are made from high-speed steel (HSS) with a titanium nitride finish for improved heat and abrasion resistance. For cleaner starts and smoother drilling, the step bits use a 118° split-point tip and a double-flute design intended to self-center, reduce walking, and clear chips efficiently—especially helpful on thin-gauge materials.
The included countersink bits are designed to create 90° screw seats in wood and soft metal, giving you a more finished look and helping screws sit flush. A tri-flat shank helps reduce slippage in the chuck under higher torque. Everything stores neatly in the included aluminum case with foam inserts, making it easier to keep the kit organized in a drawer, tool bag, or job box.
50+ size coverage (1/8” to 1-3/8”) with 5 step bits, 5 countersink bits, and a center punch
High-speed steel (HSS) with titanium nitride coating for heat and abrasion resistance
118° split-point, double-flute step-bit design for faster cutting and reduced walking
Tri-flat shank for a more secure grip in drill chucks and improved anti-slip performance
Sturdy aluminum storage case with protective foam inserts for organization and portability
Best for: DIYers and hobbyists working with aluminum, metal, plastic, and wood who want a single set for drilling, enlarging, and countersinking.
