H&X glass beads with the quality of clean,transparent,no bubbles and impurity. ... ,polishing,grinding. H&X glass beads with the quality of clean,transparent,no bubbles and impurity. Widely ... 850-425 40# 30-40 600-425 60# 40-60 425-300 80# 60-100 300-150 100# 70-140 ... %UsageGrinding MaterialBS6088 British StandardAASSHTO M247 American Standard High Quality Glass Beads for Grinding, blasting, polishing