How long should the bolts be that secure this?
Thanks for asking! The seat comes with everything needed to set it up (including the bolts). However, if you need to replace the bolts, you'll need four-inch bolts. You can contact our customer service team to see if we offer replacement bolts for this product: https://carex.com/pages/contact-us
how much weight does the seat support
This toilet seat elevator supports up to 300 lbs. Thanks for asking!