Make sure this fits by entering your model number. 【Relieves Back Pain & Improves Posture】: Our back stretcher has 114 massage points and 14 magnetic massage points that bring acupuncture effect by deeply pressing the specific acupoints. Acupuncture massage and back support for your back, relieving pain in the lumbar, back, and sciatic nerves. Back cracker relieves back pressure by stimulating the back and restores the natural line of the spine. 【Newest Upgrade】: The back cracking device can be easily adjusted to any height just by rotating the pole under the back stretcher. The maximum height can be adjusted to 3.4 inches. Experts recommend a height of 1.77" - 2.96". You can choose the most suitable and comfortable height to stretch your back and relieve stress. The higher the height you set, the stronger the stretching force you can get.