The Chimera's Adjustable Quartz Daylite speed ring features four adjustable ears to accommodate the barn door/accessory holders of a wide range of fixtures. The indexed ears are engraved at each measurement increment, and fit lights from 12 in/305mm to 21-1/2 in/546mm. This ring is designed with dual pole blocks, to fit Chimera's Quartz Standard or Daylite Standard lightbanks offering an immense versatility of light shaping.