... pilling, water well drilling or oil well drilling2,Model: various kinds and according to the requirements of ... bits, PDC bits and drill bits. Various of model and dimension available ,good condition and reasonable price4.Packing ... (7 5/8”),200.0mm(7 7/8”)212.7mm(8 3/8”),215.9mm(8 1 ... of Origin:Hebei China (Mainland)Brand Name:kingdreamModel Number:HAType:Center Drill BitGuarantee period:2~4 yearsUse:Well ...