1,bit API& ISO 2,bit size 8 1/2 215.9mm 3,bit iadc code 517 4,bit rubber/journal ... ”),200.0mm(7 7/8”)212.7mm(8 3/8”),215.9mm(8 1/2”),222.2mm8 3/4”) 241.3 ... ,637,737512,522,532,612,622,632,7326,Payment termsT/T and L/C are acceptable.(30% advanced payment after sign ... the layer.4)plz tell the quantity. 8 1/2 215.9mm iadc 517 tricone drill bit