Drop centre retrac bits for T51 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 5-1/2 in (140 mm). Hemispherical carbide.
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Thread
T51
Diameter
3-1/2 in (89 mm)
Face
Drop centre, retrac
Carbide
Hemispherical
Button layout
gauge 8 × 1/2 in, mid 4 × 7/16 in, centre 1 × 3/8 in
Flushing holes
4 × 7/16 in front
Weight
10.6 lb (10.58 lb)
Shipping estimate
Used with
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