Harken 25mm Wire Block w/Shackle 
25mm Wire Block with Shackle
Lightweight, low-friction wire blocks carry wire halyards and high-strength control lines on boats of all sizes.
- Sheave: 25mm / 1in.
- Weight: 28g / 1oz.
- Shackle pin: 5mm / 3/16in,
- Maximum wire: 2mm / 3/32in.
- Maximum line: 4mm / 5/32in.
- Maximum working load: 454kg / 1000lb
- Breaking load: 907kg/ 2000 lb