60mm Double Cheek Block + Quicklock (CCW) - Plain Bearing

Spring loaded arm for precise and reliable locking operation -the spring holds the arm in open or closed positions. 
The Quick Lock function is intended for temporary use only, and does not replace a normal clutch or a cleat. 
Acetal sheave.  
Torsionally rigid cheeks in glass fibre filled composite prevent jamming of the line.
Radial loads are absorbed by a stainless strap inside the cheeks.