Hardware is not included with our Picatinny rails, unless it is shown in the photo and specified in the product description.
If existing sling stud(s) are included on your rifle and if long enough, they could be used as a fastener. As commonly used by stock builders, we offer our BT1517 Rail Mounting Fastener Set to accommodate the installation of sling studs and rails. They are typically bedded into the stock from the barrel channel side.
We strongly recommend a competent gunsmith to do all modifications to any firearm. If you have the necessary skillset and tools, check out our video of How to Install a Rail.