The 80 mm Double Cheek Plain Bearing Block with Quick-Lock is designed to lead lines to winches and allow for them to be temporarily locked with spring-loaded locking arms. This way, the winch can be used for other purposes. Another typical application is to secure inactive spinnaker sheets / guys to prevent them to become unreeved. 

The locking arms are spring-loaded to prevent accidential locking. 

408-001-19R rotates anti-clockwise when tensioning the line.

It features glass fibre reinforced sheaves with polymer bushings, stainless steel strap for durability and glass fiber reinforced composite cheeks to prevent jamming. 

BlockType: cheek,double,quicklock
SubType: cheek double quicklock
Breaking Load: 4000 kg
Safe working Load: 2000 kg
System: PBB80
Max line size: 16 mm
Upper breaking load: 10.00 kN
Upper safe working load: 20.00 kN
Mounting: 3xM8