img{max-width:100%; height:auto;} 4 inch (102mm) 8 ohm Loud Speaker(s) Power Rating (maximum): 10w Power Rating (nominal): 5w 1 (Single Speaker) Great for Arcade Machines, Pinball & Mame Cabinets S...: 86db +- 3dB @ 1w/1m Effective Frequency Band: 20Khz THD: Maximum 5% Mounting Screw Pattern: They are 3 15 inches / 80mm apart going around the square The diagonal between mounting holes is just under 4 5 inch or just about 114mm