Hi, this simply designed grappling device has been around for decades, before Bruce Lee came along, but many people still know it and refer to it as "Bruce Lee's Grappling Machine", and that's why it's called knows and by using it he understood how important it was for his physical conditioning. This particular piece was made for Bruce by his friend George Lee (they had the same last name but unrelated) and he wore it quite often.

Materials:
3" x 3/16 (7.5 cm. x 4.8 mm.) iron
Smooth iron of 12
Pipe with internal diameter of 13 mm. and 15mm.

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