Stop Ring , Core Lifter, core lifter case are components of a whole set of core barrel.
We had been making great efforts to develop various drilling tools to meet the different needs for our customers. The drilling tools including core bits, diamond core bits, non-coring bits, reaming shells, casing shoes & casing bits, core barrels, overshots, drill rods, casing tubes, SPT tools and other drilling tools.
Size:
Wireline series: AQ, BQ, NQ, HQ, PQ, PQ3, HQ3, NQ3, BQ3, NQ2, WL-56, WL-66, WL-76
T2 series: T2 46, T2 56, T2 66, T2 76, T2 86, T2 101
TT series: TT 46, TT 56
T6 series: T6 76, T6 86, T6 101, T6 116, T6 131, T6 146
T6S series: T6S 76, T6S 86, T6S 116, T6S 131, T6S 146
B series: B46, B56, B66, B76, B86, B101, B116, B131, B146
MLC series: NMLC, HMLC
LTK series: LTK48, LTK60
WF series: HWF, PWF, SWF, UWF, ZWF
WT series: RWT, EWT, AWT, BWT, NWT, HWT(Single Tube, Double Tube)
WG series: EWG, AWG, BWG, NWG, HWG(Single Tube, Double Tube)
WM series: EWM, AWM, BWM, NWM, HWM
Other sizes: AX, BX, NX, HX, TBW, NQTT, HQTT, TNW, 412F, BTW, TBW
Chinese standard: 56mm, 59mm, 75mm, 91mm, 110mm, 131mm, 150mm, 170mm, 219mm, 275mm
Audited Supplier 
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