Harken 461 High Load Ball/Socket Swivel Base for 12mm Post Blocks. The ball-and-socket design lets blocks articulate up to 45 degrees and swivel freely. This base may be fitted with a spring but the block won´t hit the deck without one.

• Height: 51mm
• Weight: 128g
• Base diameter: 54mm
• Inside socket diameter: 12mm
• Pin diameter: 6mm
• Maximum working load: 454kg
• Breaking load: 1134kg
• Use with 75mm Carbo ratchet block