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Threadwinder.info - Cylindrical Sliding Crochet Hook Pictures

Leftmost is a bone cylinder with brass neck and tightly fitted shank with a knob for extending and retracting.
Second is a nickel cylinder with tightly fitted shank with a bump on it for extending and retracting.
Third is a tin cylinder with a hook which is extended and retracted by a tightly cinched shank and knob.
The rightmost hook is attached to a spring inside a tin cylinder. The hook is extended by pushing a knob forward
and locking it in a notch.

Cylindrical Sliding Crochet Hooks - Retracted Cylindrical Sliding Crochet Hooks - Extended