Drill America DEWCBR1-1/2 1-1/2" X 3/8" Pilot Hole HSS Straight Shank Counterbore, DEWCBR1-1/2 Shop By Category > Measurement > Calipers>Digital Calipers Brush Research 85AY1500180SC 85-Ay 1-1/2"

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Drill America DEWCBR1-1/2 1-1/2" X 3/8" Pilot Hole HSS Straight Shank Counterbore, DEWCBR1-1/2 Shop By Category > Measurement > Calipers>Digital Calipers Brush Research 85AY1500180SC 85-Ay 1-1/2"Drill America DEWCBR1 1 2 1 1 2" X 3 8" Pilot Hole HSS Straight Shank Counterbore, DEWCBR1 1 2 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