0.73ct Rectangular Cut Sapphire 5.6x3.9mm mainspring winder

0.73ct Rectangular Cut Sapphire 5.6x3.9mm mainspring winderSapphire 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:

75mm (3" inch) Square

5V AAA Battery(NOT Included)

1 (fine tips)

3 x Taper Cylinder

Color: Black

into the built-in Lemel Tray

Please turn off the power when resting between usage or finished soldering

30mm (16 gauge) Spool

An old favourite

Closing from Ø3

Reach for general use throughout the clock train

These step drills are very suitable for cutting holes in a variety of materials including steel