... soft, medium hard, hard formation Bearing rubber seal or metal seal Packing Plywood box, steel box, or as your ... : petroleum&gas,water well and mining10,Bearing sealed: metal sealed(HJ) rubber sealed(HA) not sealed(W) ... medium hard hard formation Bearing rubber seal or metal sealPacking wooden box,steel box or as your ... (17 1/2”),508(20”),558(22”),609.6(24”)660.4(26”) Steel tooth(IADC)111, 121,131117,124 ...