https://www.balluff.com/en-gb/products/BAM04C6
BAM04C6 (MV-LOCK RING SMOUNT 6KNT) Optics: Apertures, lenses, deflectors - BALLUFF United Kingdom
BAM04C6 (MV-LOCK RING SMOUNT 6KNT) - Optics: Apertures, lenses, deflectors - List price United Kingdom: 3.18 GBP - - BALLUFF United Kingdom