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#Home Depot Drill Bits#Wall Drill Bit#Twist Drill Bits for Metal
Twist drill test
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.
3 years ago
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