... 16" (8mm), 1/2" (13mm), 5/8" (16mm), 3/4" (19mm), etc.MaterialAlloy steel, carbideFormation or layerSoft, medium soft, hard ... sealed journal bearing)Aircooled bearing typeapplicationPetroleum and gas, water well, mining and tectonic industries, oil field, construction, geothermal, directional boring ... quality and better performance when PDC used in the drilling bits.3.Nearly all of our PDC cutters are ...