SP1-50x50-G SMTpads, Size 1, 50x50mil Pads, Unplated Holes to Ground Plane, 2 Sided PCB, Size 1 = 50 x 80mm (1.97 x 3.15in) Features1oz/ft2 copper with an anti-tarnish coating for easy soldering. Lead free and RoHS compatible.Size 1 = 50 x 80mm (1.97 x 3.15in), 1/16" thick (1.6mm). Four 0.125” mounting holes.0.031" (0.79mm) holes (unplated) for connections to ground plane. Just insert a wire and solder.Square SMT pads on 0.050" centers for surface mount components.Double-sided high-quality FR4 glass-epoxy circuit board with unplated holes. .