KINGSTON KITCHEN BATH L Shape Grab Bar Installation Parts: Mounting Before you begin your installation: 1. Agra bar is only as good as the way it's installed. 2. Make sure to confirm that there is proper wood backing at all three points of attachment for this grab bar. 3. If there is no wood backing available at all three points, attach minimum piece of lumber between the studs. PCs 4. Maximum weight capacity is 330 LBS.