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 ... ,522,532,612,622,632,7326,Payment termsT/T and L/C are acceptable.(30% advanced payment after sign the contranct ... ,then 70% payment after see the B/L)7,contact person8,plz add this formation in you inquiry1 ...