Made for indoor use as the steel thread is not made of stainless steel

Use a permanent marker if you don't want to be able to erase it again

you don't have to worry so much about this: the screw head is "hidden" in the counterbore

and with copper coating

This is our 1 mm

Edding 400 Permanent Marker, Mix 10-pak (1 mm.) BF Tier1 Made for indoor use asThis set includes 10 pieces of Edding 400 markers in an assortment of colors (10 different). NOTICE: As the name implies, permanent markers cannot be erased easily, so only use a permanent marker if you need to write or draw something that will not need to come off. This set is manufactured and comes from Edding. They are model 400 permanent markers with a thin fine point tip. Marker Tip width: Approximately 1 mm (0. 039 inches) Marker Tip shape: