The 811 drum cheeks swivel throug 360º, ensuring safe manoeuvres through a regular feeding of the tiller rope. The drum core is manufactured from highly resistant aluminium combining performance and lightwight features. Drum and halyard swivel are equipped with Torlon and Delrin ball bearings for increased performance and mechanical resistance. 811 model comes as standard with adjustable chain plates, allowing both mounting posiibilities (chainplates or turnbuckle)