The width of the spool can be set in three widths based on the length of the cord from 100 to 250 m (330 to 800 ft.).
The spool was designed based on experiences of numerous cave divers.
The shape and position of the handle are chosen to strain the hand as
little as possible even during continuous winding and unwinding of the
The brake is spiral with a rubber paneling and enables slowing down or completely blocking the reel.
In the side of the reel on the side of the handle there are shallow
openings, through which you can even in complete darkness tell through
your touch if and how fast the cord is being unwounded and eventually to
slow the spool with your thumb.
The handle for winding the reel is rotatable and equipped with a deep
recess with distinct edges, so that it does not slip out of a bare hand
or a thick glove easily.
The spool is precisely worked; therefore it was possible to keep the
opening between the steady and rotatable parts so narrow, that not even a
thin cord can get stuck in it, which is often a very uncomfortable
complication when working with cords.
In the axis of the reel there is a square 1 inch big, into which a
standard square socket bit adapter fits precisely. This make the
preparation of cords on the surface much easier.