Alc 40102 60 grit aluminum oxide – 50 lbs. 50lbs medium, 60 grit, 0.016″, 9.0 mohs; high quality, fast cutting abrasive typically used in a blast cabinet or where the abrasive is being recycled; stays sharp and has a longer life cycle than other abrasives; penetrates deep into hard metal surfaces and is an excellent choice where a semi coarse finish is desired; can also be used for glass etching; note: the size of the blaster nozzle should be three to four times larger than the grit size of the abrasive being used, the larger the nozzle size, the more cfm of air is required