Bit O.D. (in)	Working O.D.	End O.D. of body	I.D.	length	Length(mm)				Thread code on two end
					Short type		Long type		Drill string type		Near bit type
					Near bit type	Drill String type	Near bit type	Drill String type	Top	Down	Top	Down
6	152.4	121	51	300 - 500	800- 900	1000- 1100	1200- 1400	1400- 1600	NC38	NC38	NC38	3 1/2 REG
6 1/4	158.7
6 1/2	165.1
7 1/2	190.5	159 165 178	57 71			1000	1600	1800	NC46	NC46	NC46	4 1/2 REG
7 7/8	200.0
8 3/8	212.7			400 500 600		1000- 1200	1600- 1800	1800- 2000	NC46 NC50			4 1/2 REG
8 1/2	215.9
8 3/4	222.2
9 1/2	241.3	178 197	71	400- 600	800- 1000	1000- 1200	1600- 1800		NC50	NC50	NC50	6 5/8 REG
9 5/8	244.5
9 7/8	250.8
12 1/4	311.2	203 229	76	400- 600	1000 1200	1200 1500	1800 2000		NC56 6 5/8 REG			6 5/8 REG
17 1/2	444.5			400 -600	1200- 1300	1200- 1300	2000- 2200	2000- 2200	NC61 7 5/8 REG