$fn = 25;

table_thickness = 38;
holder_width = 50;
grabber_length = 40;
thickness = 4;
hole_diameter = 21;
hole_depth = 30;

cube([holder_width, thickness, table_thickness + thickness*2]);
cube([holder_width, grabber_length + thickness, thickness]);
translate([0, 0, table_thickness + thickness]) {
    cube([holder_width, grabber_length + thickness, thickness]);
}

// Hole
// Honestly not sure where some of these values come from
translate([holder_width / 2, -(hole_diameter + thickness) / 2, table_thickness - hole_depth/2 + 2*thickness]) {
    difference() {
        group() {
            cylinder(d = hole_diameter + thickness, h = hole_depth, center = true);
            translate([-(hole_diameter + thickness) / 2, 0, -hole_depth / 2]) {
                cube([hole_diameter + thickness, hole_diameter / 2 + thickness + 0.5, hole_depth]);
            }
        }  
        translate([0, 0, thickness]) {
        cylinder(d = hole_diameter, h = hole_depth, center = true);
       }
    }
}