(underlining is mine)
FOUNDATION WEEP SCREED (NO. 7)
This bead is now required by most building codes and by ASTM C1063 on all framed walls as part of a drainage system for exterior stucco applications. The 3½ inch nailing flange serves as a flashing
when water resistant breathable building paper or paper backed lath is installed over the flange. The "V" stop is punched with holes primarily intended as keying mechanisms. These also offer minor moisture weeping capabilities. As stucco cures it will shrink slightly away from the "V" stop allowing moisture to flow down the building paper and exit down the sloped surface. Available in galvanized steel and zinc alloy (by special request) in 10 ft. lengths. Packaged 10 pcs. per bundle,100 bundles per pallet.
AMICO Metal Lath and Vinyl Bead Building Products > Foundation Weep Screed
I should have included the 'J' plaster ground link to, here it is: 3rd item down
AMICO Metal Lath and Vinyl Bead Building Products > Casing Beads