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. 

408-001-22R rotates 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
Max line size: 16 mm
Upper breaking load: 20.00 kN
Upper safe working load: 10.00 kN
Mounting: 3xM8