Purchased to engrave and etch window glass. Setting pressure: approx. 1/8 of the spring deflection, i.e. very little pressure. The tip went about 5 minutes and stopped cutting, the description says "They are ideal for engraving various types of materials including brass, aluminium, glass." My tip went flat after a very short use. The "diamond" tip has completely disappeared. I don't know how long it will last in metal, all I know is that it won't cut even though the description says glass!
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