list1 = [
[115.57, 20.355],
];

list2 = [
[-2.43, -2.43],
[81.57, -2.43],
];

thickness = 10;

projection(cut=true)
difference()
{
    translate([-24.46,-11.87,-thickness])
    cube([264.06,138.7,thickness]);
    for (iii=list1)
    {
    translate([iii[0],iii[1],-thickness-1])
    cylinder(d=0.5,h=thickness+2,$fn=30);
    }
    for (iii=list2)
    {
    translate([140+iii[0],19.34+iii[1],-thickness-1])
    cylinder(d=0.5,h=thickness+2,$fn=30);
    }
}