Spax Stainless Steal Washer Head

Application
•For use outside (e.g. carports, playground equipment, pergolas, porches, bridges, bridge plank flooring, balconies)
•Fastening of sheet metal (e.g. solar roof hooks)

Advantages
•Better tightening of connections also of warped boards
•Washer head guarantees higher beam supporting forces and allows savings with regard to piece numbers and working time

See more at:
http://www.spaxpacific.com/products/8mmwhss.html#sthash.JfoLdNcR.dpuf

Lots of sizes available

Pricing is per screw