... ,drilling pipe Kellys is driving section of wohole drill stem. Kelly is available with square kelly and hexagonal kelly. ... from API Spec7-1 and SY/T6509-2000 standard.Kelly drill pipe,drill pipe,drilling pipe.Technical specification and parameters.. SizeLengthinUpper box ... /8REG 196.8 NC56177.882.6133.3175.4151.6.. Kelly drill pipe,drill pipe,drilling pipe