has anyone tried these to polish frets on a guitar?

Not guitar frets specifically, but I have made many types of metal gleam like a mirror so I have no doubt that they would work.

Can these be used to sharpen knives?

These are designed for fine finishing of soft materials like plastic. Could you sharpen a knife with them, theoretically, sure....if you wanted to spend years doing it. I wouldn't even use them to put a fine edge because it would take too long

Is this the same type of micro mesh that's sold through Stew Mac?

I’m not sure what Stew Mac sells, but if you are looking to purchase them for fret polishing, they would do nicely, Various grit sand paper sticks on a foamcore board.

Material	Sponge
Item dimensions L x W x H	10.2 x 8.9 x 1.3 Centimeters
Brand	Micro-Mark
Grit Type	Ultra Fine
Compatible Material	Plastic
Item Weight	0.1 Pounds
Grit Number	7000
UPC	810041930743
Number of Items	1
Manufacturer	'Infini Models
Country of Origin	USA
Model number	88642
Colour	Black
Special Feature	Washable
Specific Product Use	Interior
Item Weight	45.4 g
Product Dimensions	10.16 x 8.89 x 1.27 cm; 45.36 g
Item model number	88642
Item Height	0.5 Inches
Item Width	3.5 Inches
Included Components	One each 400, 600, 800, 1000, 2000, 3000, 5000 and 7000 grit
Are batteries included?	No

Softback Polishing Sticks

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