Drop centre retrac bits for ST58 drill strings. A drop centre drills straighter holes in medium to hard rock. Retrac skirts help in broken ground, keep holes straighter and make the bit easier to retrieve. Diameters from 3-1/2 in (89 mm) to 5 in (127 mm). Hemispherical or semi-ballistic carbide.
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Thread
ST58
Diameter
3-1/2 in (89 mm)
Face
Drop centre, retrac
Carbide
Hemispherical
Button layout
gauge 8 × 7/16 in, front 4 × 7/16 in
OEM catalogue number
A44934
Shipping estimate
Used with
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