Drop centre bits for R38 drill strings. A drop centre drills straighter holes in medium to hard rock. Diameters from 2-1/2 in (64 mm) to 4 in (102 mm). Hemispherical carbide.
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Thread
R38
Diameter
2-1/2 in (64 mm)
Face
Drop centre
Carbide
Hemispherical
Button layout
gauge 6 × 7/16 in, mid 3 × 3/8 in, centre 1 × 5/16 in
Flushing holes
3 × 5/16 in front
Weight
3.7 lb (3.75 lb)
Shipping estimate
Used with
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