Mounting Hole Distance: 16 x 13mm/0.63' x 0.5'(L*W); Mounting Hole Size: 3mm/0.12'(D) Unfolded Size: 25 x 20 x 4mm/1' x 0.8' x 0.16'(L*W*H); Folded Size: 25 x 12 x 4mm/1' x 0.4