3.1/3.2/3.3/3.4/3.5/3.6/3.7/3.8/3.9/4.0mm Cobalt stainless steel straight shank twist drill Metal iron aluminum alloy drill

3.1/3.2/3.3/3.4/3.5/3.6/3.7/3.8/3.9/4.0mm Cobalt stainless steel straight shank twist drill Metal iron aluminum alloy drill

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