This 16 bit forstner set includes cutting diameter of: 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8", 1-1/2", 1-5/8", 1-3/4", 1-7/8", 2" and 2-1/8". The solid steel construction provides strength and durability resulting in effortless and smooth operation. Forstner bits are a great option for cutting clean and accurate flat bottom holes. Except for the slight notch created by the centre spur, the resulting holes are clean and smooth. The middle spur helps centre the bit, while the outer rim helps maintain the bits position when drilling angled or overlapping holes. Steel forstner bits are sharp and rugged which will perform flawlessly over and over again.