Four Piece 100 Degree Countersink Bit Set For Aluminum And Soft Metals With 1/2 Inch Cutter Diameter And 1/4-28 Thread Includes Bit Sizes 12 21 30 40 Three Fluted High Speed Steel Sweet For Chamfering Holes And Clean Flush Finishes

4-Piece 100° Countersink Set for Aluminum Work
✔️ 1/2 in diameter, 4 bits, 1/4-28 thread, 3-flute HSS

This four-piece countersink bit set is designed for chamfering holes and creating flush, finished seating in aluminum and other soft metals. The 100° countersinks deliver clean, precise chamfers suitable for screw heads and fasteners in metalworking projects, hobby machining, and electronics enclosures.

✅ 4 pc set of 100° countersink cutters, 1/2" diameter
✅ Includes #40, #30, #21, #12 sizes for chamfer depths
✅ 1/4-28 threaded shanks for common setups
✅ 3-fluted high speed steel construction for smooth cutting
✅ Fixed integral pilot provides cutting accuracy
✅ Not for steel; suitable for aluminum and soft metals only

💡 What is a countersink bit set used for in aluminum projects? It's handy for creating chamfers and flush screw seats with clean finishes.

- Creates a beveled edge to seat fasteners flush in aluminum - Handy for chamfering holes in soft metals to reduce stress risers - 100° countersink angle helps ensure proper seating depth and appearance