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Twist drill test

4 year ago
152 1
Video details
The diameter of twist bit is limited by the aperture, the spiral groove makes the drill core thinner, the drill bit stiffness is low; Twist drill bit for concrete only two rib belts guide, the axis of the hole is easy to skew; Cobalt Twist drill bit Horizontal edge makes centering difficult, axial resistance increases, the drill is easy to swing.
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