As Brickguy said, "Yes". If the hole is already the correct size for a slug (they come in 1 1/8", 1 1/4", and 1 3/8" diameters), it can go directly in the hole. If the hole is any other size, your driller will have to enlarge it. Even if (for example) the hole is 1 1/8", but has a lot of bevel, he will probably enlarge it. -- JohnP