I need to install post supports to concrete floor. I'm thinking of using through bolts to fix the supports. What size of through bolt should I use? Are there any better options of fixings to use to secure the below post supports.
http://www.screwfix.com/prods/99237...ng/Bolt-Down-Post-Support-75-x-75mm-Pack-of-2
http://www.screwfix.com/prods/99237...ng/Bolt-Down-Post-Support-75-x-75mm-Pack-of-2