A single block, with an opening in its side below the sheave, or at the bottom, to receive the bight of a rope.

A block that can beopened on one side to allow a cable or rope to be laid in the block, instead of threading it through from one end.

a block that can be opened on one side to receive the bight of a rope

a block in which the eye of the block opens so that a line (cable) can be laid in the sheave of the block

a hook or eye attached to a large pulley wheel through which the winch cable runs

a pulley that opens up to make it possible to position the cable on the pulley wheel rather than having to thread the cable through it - which would be impossible when you have any sort of device, such as a hook or an eye, on the end of your cable

a pulley that you mount to a fixed point using a D-shackle (there's another use) and possibly a tree saver

A pulley in a case with a shackle or clevis point on one side. Used properly it can double the line pull of your winch

A block with one side capable of being opened for the insertion of the rope. Its office is to change the direction of the rope.

A single sheave block with a hinged strap that can be opened and the bight of a line inserted.

block that can be opened on one side, allowing it to be placed on a line that is already in use.