... and shape.2. Applying the world's latest sealing technology, metal face sealing ensures the bearing the bearing sealing is ... Bit type: GHJ437, Drilling weight: 0.35~0.90 KN/mm, Rotary speed, 300~60 r/m.2, Soft ... Bit type: GHJ517, Drilling weight:0.35~1.05 KN/mm, Rotary speed, 250~60 r/m.3, Medium ... Recommended Bit type: GHJ537, Drilling weight 0.5~1.05 KN/mm, Rotary speed, 200~40 r/m. ( function(){ ...