Special designed hand pump to expand the gasbag and then
    expand the narrow working space.
Content：3 sizes gasbags:  7" (180 mm) x 1-1/2" (38 mm)
                                               7-1/2" (190 mm) x 2-3/8" (60 mm)
                                               6-3/8" (160 mm) x 6-3/8" (60 mm)