OOpth, Sent to you privately and should have sent to the list. Website for grit that I looked at is: http://www.cs.rochester.edu/u/roche/rec.wood.misc/grit.sizes.html and this indicates that 1000 grit is about 9 micron while 40t is about 320 grit. Bob May http://nav.to/bobmay bobmay@nethere.com NEW! http://bobmay.astronomy.net