Seasure white nylon shackle. Snap on. Used for attaching slides to mainsails.
Made in UK.
Three sizes available.

DIMENSIONS:
6MM SHACKLE:
Internal Length: 20mm
Internal Width: 8mm
Pin Diameter: 6mm
Overall Length: 36mm

8MM SHACKLE:
Internal Length: 29mm
Max Internal Width: 12mm
Opening Width: 8mm
Pin Diameter: 8mm
Overall Length: 46mm

8MM LONG SHACKLE:
Internal Length: 42mm
Max Internal Width: 12mm
Opening Width: 8mm
Pin Diameter: 8mm
Overall Length: 60mm