... specification and SY/5146 standard. 1.Size: 3 1/2", 4",4 1/2", 5", 5 1/2",6 5/8"2.Products description:Our integral HWDP is ... the drill collars. The advantages include:1.Reduced torque in high-rpm, deep drilling.2.Less trip time as compared to ... pin and box end, plus one 1" band on 18°shoulder of box.Two 3" wear bands on central upsetsThe ... and extend using time. Heavy weight drill pipe(welding,3-1/2")