The tapered reamer on top came from Speedway Motors and has 1.5 inches of taper per foot. It closely matches the taper of a Dana 44 knuckle ball joint. The lower three reamers are spiral flute, round-shank reamers that taper to a maximum diameter, specifically 3/4-, 5/8-, and 1/2-inch. A reamer is more precise than a common drill bit and is easier to control. I got these from McMaster-Carr.