Securely fix your mount to flat surfaces using one of Quad Lock's Rectangle Flat Hole Bases. Choose between a 2 hole or a 4 hole base. Both bases can be fixed to flat surfaces vertically, diagonally or horizontally. Each base uses the universal AMPs hole spacing standard and the holes will accept 10G or M5 countersunk fasteners (if using the 4 hole base, Quad Lock recommend using all four hole screws for the strongest connection). A 10 mm spacer and two screws are supplied for connecting the spacer to a Quad Lock 360 HEAD or ARM (note: Screws are not provided for mounting the base to your required surface). Both Rectangle Bases are built with tough nylon and use the universal AMPs hole spacing standard. The holes will accept 10G or M5 countersunk fasteners. Tech Specs: 2 Hole Base: