Features and Benefits:?Increased drilling precision: Achieve exact spot drilling?Versatile: Use with Milwaukee core bits 1-3/4" or larger and corresponding Milwaukee guide platesIncrease your precision in masonry and concrete drilling with the Milwaukee? centering pin for large thin wall core bits. You'll get exact spot drilling when you use Milwaukee's heavy-duty centering pin and guide plate (not included) for starting holes with all rotary hammer drills.