... 8mm detailed spec:2008 sand blast nozzle is a kind of hardness nozzle use for surface peeling, rust remove,and sand ... looking,wearable.2008BC boron carbide nozzle is the best nozzle,Hardness:99 degree, wearable coefficient: 0.0127, density:10g/cm3 ... can be 1000H if working 8 H continuous.Feature: hardness,high pressure-resistance,long use lifeperformance data:materialstyleaperture(mm)specdimentionweight ...