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 3-1/2 in (89 mm). Hemispherical or semi-ballistic carbide.
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Thread
R38
Diameter
2-1/2 in (64 mm)
Face
Drop centre
Carbide
Hemispherical
Button layout
gauge 6 × 13/32 in, front 3 × 13/32 in
OEM catalogue number
A44880
Shipping estimate
Used with
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