... li mestones. Size and IADC available: 3 3/4" to 26" IADC 415,435,445,417,437 ... (8 3/8”),215.9mm(8 1/2”),222.2mm8 3/4”) 241.3(9 1/2”),244. ... (13 5/8”),349.2(13 3/4”)374.6(14 3/4”)381(15”),393. ... kingdreamModel Number:HAType:Center Drill BitGuarantee period:2~4 yearsUse:Well Drilling Rotary speed:300 ... of Sesling:Rubber RingsTypes of Bearing:Joumal Beanngs(2)Packaging & Delivery Packaging Detail:carton, wooden ...