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Made from heavy steel tubing with diamonds set in a tough metal matrix and bonded to bit segments.
Standard core sample bit dimensions:
4 1/4 in (10.8 cm) OD, 4 in (10.2 cm) ID x 13 in (33 cm) deep, and
6 1/4 in (15.9 cm) OD, 6 in (15.2 cm) ID x 13 in (33 cm) deep.