After the support main rod stress levels - line, so that after the top supporting more stable, to avoid the screw from the main rod. Help production of smooth operation, is suitable for the length of more than 300mm screws.
After the support main rod stress levels - line, so that after the top supporting more stable, to avoid the screw from the main rod. Help production of smooth operation, is suitable for the length of more than 300mm screws.