7-piece high-speed steel, solid capscrew counterbore set. 3 flute, straight shank. Straight shank item. Bits are sharp and effective.
Pilots are not removable or interchangeable.
7-piece high speed steel cobalt counterbore set. Used for expanding general rough hole, or for hole processing for bolts. 3 lips for regrinding create a smooth chip flow and powerful cutting resistance.
Pilot portions of each bit are not removable or interchangeable.
21-piece, high speed steel, interchangeable pilot counterbore set. Includes 14 pilots with a 5/32-inch shank. Also includes 6 counterbores. One holder with a 3/8-inch shank.
Not very precisely machined. Pilot shanks are a loose fit.
7-piece, high speed steel metric capscrew counterbore set. 3 flute straight shank. Includes M3, M4, M5, M6, M8, M10, M12. Bright Finished. Makes clean holes, even in metal.
Case may break easily.
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A steel counterbore set can provide the range of sizes you need for drilling pilot holes properly. A counterbore is a pilot hole with a flat-bottomed opening to accommodate for screw heads. The number of pieces in a counterbore set varies. If you know you’ll need a range of sizes, you may want to opt for a set with as many as 22 pieces. Some sets may include interchangeable pilots, which offer more options and versatility. Organized storage in a wooden case can make for easy use and portability. If you need to work with materials tougher than wood, ensure that the bits in the set you purchase are durable and up for the task.
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