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1 * Tapered Reamer
time and energy conveniently
This product adopts high-tech
Beat error measurement: 0 to 4ms (+ / - 0
Diameter of Drill Shank Head: 9
0.75ct Princess Cut Sapphire 4.9mm Diamond Grading Case 1 * Tapered ReamerSapphire is a variety of the mineral corundum, an aluminium oxide. It is typically blue but fancy coloured sapphires also occur. The variety in colours is due to trace amounts of elements such as iron, titanium, chromium, copper and magnesium. Mohs Scale of Hardness: 9 (out of 10). Sources: Mines that have yielded the finest sapphires in colour and clarity are located in Kashmir, Myanmar and Sri Lanka. Nowadays the main sources of sapphires are: