Basic Information on Collars etc.:

collar (noun): any of several iron or steel devices that fit around the neck of a slave; in
Torvaldsland, they are of iron, hinged, and fastened with a rivet
collar, lock (noun): a hinged collar easily removed by the use of a key; usually of flat
stock, c. 1-1/2" to 2" high; usually worn by trained slaves; the lock has one pin for each of
the letters in the word 'kajira'
collar, plate (noun): collar of flat stock which is hammered about a slave's neck; usually
worn by untrained slaves
collar, Turian  (noun): a slave collar of cylin- drical stock, rather than the normal flat stock
of northern lock collars; fits more loosely that a lock collar, enabling it to turn around the
wearer's neck
ko-lar (noun): slave collar
plank collar (noun): a two-piece board hinged at one end and capable of being locked at
the other, similar in operation to the stocks of 18th-century America and England; it has
two or more semi-circular holes cut in each side so that it may fit around the necks of
more than one slavegirl or captive free woman at one time
shipping collar (noun): a loose, generic collar worn by slaves when being shipped as cargo
slave steel (noun): generic term for collars, chains, siriks, etc. worn by slaves

Taken from: Savages of GOR, pages 135-136
(Thank You Master NorrisWarAxe)
Example of a ISBU Collar:
    The collars had front and back rings, were hinged on the right and locked
on the left. This is a familiar form of coffle collar. The lengths of chain
between the collars were about three to four feet long. Some were attached to
the collar rings by the links themselves, opened and the closed about the
rings, and some of them were fastened to the collar rings by snap rings.
Another common form of the coffle collar has its hinge in the front and
closes behind the back of the neck, like the common slave collar. It has a
single collar ring, usually on the right, through which, usually, a single
chain is strung. Girls are spaced on such a chain, usually, by snap rings. An
advantage of the first sort of coffle arrangement is that the chain may, as
girls are added or subtracted, be shortened or lengthened. A chain which has
been borne by fifty girls would, of course, be impracticably heavy for five
or six. An advantage of the second arrangement is that girls can be easily
spaced on the chain, more or less closely together, and can be conveniently
removed from, and added to, the chain.

Taken from: Savages of GOR, pg. 214
(Thank You Master NorrisWarAxe)
It is death to a slave, indecently, to remove such a collar without
permission. Furthermore the collar is fastened by what is, in effect, a
signature knot, a complex knot, within a given tribal style, whose tying is
known only to the individual who has invented it. It is thus, for most
practical purposes, impossible to remove and replace such a collar without
the master, in his checking of the knot, by untying and retying it, being
able to tell. Suffice it to say, the slaves of red savages do not remove
their collars.

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