Exercise expander adaptor for door frame has two stainless steel sheets pressed to form stepped surfaces to fit between door and frame

摘要

The exercise expander adaptor (1) to fit between a door frame and door leaf has a pair of stainless metal sheets pressed to form ninety degree stepped surfaces. The adaptor is made of one point five millimeter thick stainless steel. The engagement faces (4-8) of the adaptor can have a felt lining.