Audio Board For Amplifier DIY Color:Black/Red/Blue/Green/Yellow Material of Board : FR4 Board Length: 300mm Width: 60mm Board Thickness: 2mm This board has a total of 180 holes, 6 rows, 30 holes in each row, the diameter of each hole is 3.0mm. Quantity: 1PC We are a turret board manufacturer, if you need to purchase in large quantities, please contact us.Can customize various turret boards.