... Formationsticky, soft, medium hard, hard formation Bearing rubber seal or metal seal Packing Plywood box, steel box ... 6 1/8”),158.7mm(6 1/4”),161.9mm(6 3/8”),165.1mm(6 1/2”)190.5mm(7 1/2”),193.6mm(7 5/8”),200.0mm(7 7/8”)212.7mm(8 3/8”),215.9mm(8 1/2”),222.2mm8 3/4”) 241.3 ... your requirementsDelivery Detail:within 7 days after your payments Metal/Rubber Seal API Kingdream Newest 3 1/2" IADC 137 Cone ...