Harken 300 25mm High Strength Block. Wire blocks are lightweight, low friction blocks designed to carry wire halyards and control lines on boats of all sizes. This block uses low-friction thrust washers and stainless steel sideplates which give superb chafe resistance.

• Sheave diameter: 25mm
• Weight: 28g
• Maximum wire diameter: 2mm
• Maximum line diameter: 4mm
• Shackle pin diameter: 5mm
• Maximum working load: 454kg
• Breaking load: 907kg