New style Black Spring Loaded Bearings (SLB) are for use with new style Loaded Chamber Indicator (LCI) extractors only. They are shorter than the original SLB and cannot be used with the old style extractors. Fits all 9mm and 380ACP Glock pistols (does not fit the G42,43,43X,48 models) use only with LCI extractors. Part number 7 on the Glock Schematic.
excellent product of the highest quality