Type DLT-T Releasable Reversing Overshot , a type of fi shing tool designed to recover and back off the stuck pipeshaped fi sh like drill pipe ,oil tubing, ect. Its distinguishing features are as follows : to unscrew and recover the stuck fi sh; to release the fi sh down hole if necessary; to circulate the washing fl uid.

Technical parameters and specifi cations

Type	O.D. (mm)	Catch size (mm)	Allowable pull force(KN)	Reversing tensile force and applied torque		Thread conn.
				Tensile force(KN)	Torque (N・m)
DLT-T9548	95	47.0-50	250	120	3100	2 7/8REG
DLT-T10560	105	60-62	350	150	5750	2 7/8IF(NC31)
DLT-T11473	114	72.0-75	420	180	7750	2 7/8IF(NC31)
DLT-T13489	134	88-91	500	180	10250	3 1/2IF(NC38)
DLT-T145102	145	101-104	700	200	11050	3 1/2IF(NC38)
DLT-T160114	160	113-115	900	200	12150	4 1/2REG
DLT-T185127	185	126-129	1200	240	13500	4 1/2IF(NC50)
DLT¨CT200140	200	139-142	1500	240	15300	4 1/2IF(NC50)