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Buy low priced dth drill bits from dth drill bits factory, we provide good quality dth drill bits from china.

Centering bit 48-20-5495 (included) is recommended for exact spot drilling and to avoid bit wandering during use. the drift key 48-20-5497 (not included) allows for easy removal of the centering bit. the one piece core bits are available in sds-max or spline shanks, ranging from 1-1/2” to 6” diameters and overall lengths of 11-3/8” or 22”, with a drilling depth of 3”.

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73mm, 89mm, 91mm, 114.3mm, 139.7mm nw hw casing pipe. description: 1. our nw hw pw casing tubes are of the highest quality ,are manufactured to exacting specifications using advancing maching technoogy. 2. they are manufactured from seamless steel tube by cold drawn.the material is xjy850/30crmnsia which meets the global standard. 3.

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