Concentric Casing System Type1

Type	Casing OD (mm)	Casing Min ID (mm)	Reaming Diameter (mm)	Casing Shoe Min ID (mm)	Pilot Bit Max OD (mm)	DTH Hammer
GL70A-70-89	89	77	98	71	70	GL70A
GL90-85-108	108	94	112	86	85	GL90/GL90-I
GL335-85-108	108	94	114	88	86	GL335
GL335-90-114	114	98	127	91	90	GL335
GL335-100-127	127	114	136	101	100	GL335
GL110-120-146	146	130	156	121	120	GL110
GL4.5-120-146	146	130	156	121	120	GL4.5
GL340-120-146	146	130	156	121	120	GL340
GL350-140-168	168	152	180	142	140	GL350/355/355K
GL350-145-178	178	160	183	146	145	GL350/355/355K
GL350-150-183	183	165	190	152	150	GL350/355/355K
GL360-186-219	219	194	240	187	186	GL360
GL360-194-219	219	194	240	195	194	GL360
GL360-203-219	219	203	240	206	203	GL360
GL380-203-219	219	205	240	206	203	GL380
GL380-203-245	245	232	266	206	203	GL380
GL380-241-273	273	260	305	244	241	GL380
Code annotation of casing reamer bit as bellow
Example： GL350-140-168
GL350(Equal to DHD350)=Hammer type, 140= Pilot Bit Max OD (mm), 168=O.D of casing pipe(mm)