High quality hard rock drilling bits D32mm - D60mm core drills tips taper cross bits for rock drilling, tunnel

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1pc High quality hard rock drilling bits/stone chisel 28mm-D60mm core drill bit tips taper cross bits for rock drilling,tunnel

1pc High quality hard rock drilling bits/stone chisel 28mm-D60mm core drill bit tips taper cross bits for rock drilling,tunnel

1pc High quality hard rock drilling bits/stone chisel 28mm-D60mm core drill bit tips taper cross bits for rock drilling,tunnel

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