Used Schaefer single sheave non locking block. 5 1/2″ overall in length including the shackle X 2 1/2″ wide and 1″ thick. 2 3/8″ diameter sheave. This block compares to model 704-05 but is non locking. No damage or looseness and only minor scratches from normal use. Skippers Marine specializes in new old stock, recycled and those hard to find marine parts and accessories. Please check out my other Ebay store items. Don’t see what you are lookening for? Feel free to send an email request. 3-0228