I used two 1/4 inch bevel head screws to mount my saw. Countersink the heads so they are just below the surface of the saw table's top surface. Many circular saws will already come with two holes in the base. If your saw does not have these holes, you can drill your own mounting holes. Just be careful that the ends of the screws do not obstruct anything essential. Wing-nuts and lock-washers are adequate for securing the saw under the table.