https://www.ronstan.com/swivel-180-swivel-base-cleat.html
Swiveling Cleat Unit, 28mm Ball Bearing Sheaves | Ronstan Sailboat Hardware
ball bearingsailboat hardwarecleatunitsheaves
https://westcoastsailing.net/harken-38-mm-wire-block-becket-313/
Harken 38 mm Wire Block w/ Becket - HAR 313 | Harken Sailboat Hardware at West Coast Sailing
Lightweight, low-friction wire blocks carry wire halyards and high-strength control lines on boats of all sizes.
west coast sailingsailboat hardwareharkenmmwire
https://www.mariner-sails.com/sailing/sailboat-parts-hardware/sailboat-hardware/page3.html
Sailboat Hardware - Mariner Sails
sailboat hardwaremariner sails