Makita's 7 Piece Concrete Drilling Set is designed for up to 4" Drilling into light concrete and brick material applications. Sleeve protected for safekeeping, the 7 piece drilling bit set has 5 of the most commonly used drilling, screwing or anchoring sizes of 3/16", 5/32", 1/4", 5/16" and 3/8" for easy drilling. Concrete drilling bit set is optimized for Makita Hammer Drills while also fully compatible with all other Hammer Drills.