... at high temperature and super high pressure, with good performance for oil/mining drilling bits. Different shapes and sizes, such as cylinders, triangles ... *1.5*4,1.5*1.5*5,2*2*10,3*3*10,4*4*10,etc.Triangle :4*4*4*2.6,4*4*4*3,6 ... *6*6*4.5,6.2*6.2 ... *6.2*4.3,etc.Cylinders:1.5*4,1.8*4 ...