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Get the Drill America - 1/8-27/64 100 Degree Countersink and experience the perfect combination of performance and protection for your professional needs
87 cal/cm2 arc rating
Precision Fit: Engineered for a secure and leak-free connection
25 Carbon Steel Hex Die
Thread Size: m13
2-1/4" X 1/2" Pilot Hole HSS Straight Shank Counterbore - High Performance & Durable Cutting Tool | Drill America Sets & Kits Get the Drill America -Counterboring is the enlargement of a portion of a hole that has previously been formed. If the counterbored portion is shallow (1 8" or less), the operations is usually known as spot facing; for example, a flat seat for a bolt head or nut. If, on the other hand, the hole is enlarged to a considerable depth, it is designated as counterboring. These counterbores are made of two piece construction, having an integral shank and counterbore cutter, and a