Although early metalsmiths learned how to increase the hardness of copper, granite was still over four times as hard. The very hard sand particles imbedded themselves in the copper blade and were ...
Product Name: Diamond tip masonry bit, Stone cutting bits, Granite hole bit, Drill bits for rocks Outer Diameter : 20mm(3/4 inch); Inner Diameter: 17mm; Drill Depth: 29mm Please add water for coolant ...
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