Q series core bits
Size	O.D	I.D	Availability
Size	mm	mm	Imp.	S.S	T.C.	PDC	TSP	E.P.
AQ	47.75/47.50	27.10/26.85	√	√	√	√	√	√
BQ	59.69/59.44	36.52/36.27	√	√	√	√	√	√
BQ3	59.69/59.44	33.65/33.40	√	√	√	√	√	√
NQ	75.44/75.19	47.75/47.50	√	√	√	√	√	√
NQ3	75.44/75.19	45.21/44.96	√	√	√	√	√	√
HQ	95.76/95.38	63.63/63.38	√	√	√	√	√	√
HQ3	95.76/95.38	61.24/60.99	√	√	√	√	√	√
PQ	122.30/121.80	85.09/84.84	√	√	√	√	√	√
PQ3	122.30/121.80	83.18/82.93	√	√	√	√	√	√
Core bits for N-series double core barrels
NMLC	75.44/75.19	52.12/51.87	√	√	√	√	√	√
HMLC	98.98/98.60	63.63/63.38	√	√	√	√	√	√
Core bits for T2 series double core barrels
T2-46	46.18/45.92	31.82/31.57	√	√	√	√	√	√
T2-56	56.13/55.88	41.83/41.58	√	√	√	√	√	√
T2-76	76.12/75.87	61.82/61.57	√	√	√	√	√	√
T2-86	86.13/85.88	71.83/71.58	√	√	√	√	√	√
T2-101	101.12/100.87	83.82/83.57	√	√	√	√	√	√
Core bits for T6 series double core barrels
T6-76	76.12/75.87	57.12/56.87	√	√	√	√	√	√
T6-86	86.13/85.88	67.13/66.88	√	√	√	√	√	√
T6-101	101.12/100.87	79.12/78.87	√	√	√	√	√	√
T6-116	116.20/115.82	93.14/92.89	√	√	√	√	√	√
T6-131	131.19/130.81	108.13/107.88	√	√	√	√	√	√
T6-146	146.18/145.80	123.11/122.86	√	√	√	√	√	√
Core bits for Chinese standard single tube core barrels
59	59.5	41.5	√	√	√	√	√	√
75	75.2	54.5	√	√	√	√	√	√
91	91.2	68	√	√	√	√	√	√
110	111.2	93	√	√	√	√	√	√
130	131.2	113	√	√	√	√	√	√
150	151.2	133	√	√	√	√	√	√
170	171.2	149	√	√	√	√	√	√
219	225.2	197	√	√	√	√	√	√
Core bits for Chinese standard double tube core barrels
75	75.2	54.5	√	√	√	√	√	√
91	91.2	68	√	√	√	√	√	√
110	111.2	93	√	√	√	√	√