The cheekplate revolves around the sheave axle allowing the block to open; a safety ball prevent the block from opening and an adjustable screw allows to set the ball on locked position.
There is a becket for the “hanging line”.
Material: sheave with composite fibre main bearing and double side ball bearing.
Hard anodized and teflon coated Aluminum cheekplates with side rubber protections (yellow rubber on the revolving cheekplate).