The first bullnose router bit set that I had a look at was the Woodline USA WL-2013 6 piece ½ inch shank set.
Woodline USA 6 Piece ½ inch shank bullnose set
This set comprises 6 bullnose router bits with a ½ inch shank and they are ideal if you are looking for curved edges for furniture, stairs, tables etc. The bits are tipped with industrial carbide and come with a lifetime warranty.
They also have a guide bearing which ensures that you can use a pattern easily and unless your requirement is very obscure you should find something here to suit any job you have because you get a ¼ inch bead diameter, a 3/8 inch, a ½ inch, a 5/8 inch, a ¾ inch and a 1 inch.
This router bit set is currently on sale at Amazon with a 25% reduction in the regular price. If you are interested in learning more or to check out other customer reviews and specifications you can use this link.
CMT Bullnose Router Bit
This bullnose router bit is a top seller and has a ½ inch shank, 7/8 inch diameter and ¾ inch cutting length. CMT are well known and well regarded producers of bullnose bits and this bit will give you a really nice finish on window sills, shelves, stair treads etc.in one cut.
CMT bullnose bits have bead diameters which range from ¼ inch to 1 inch and have an anti kickback design.
You can investigate further if you like at Amazon through this link.
Grizzly Bull Nose bit, ¼ inch shank, ¾ inch cutter diameter.
This bit is ideal for full beading and rounding edges and has a cutting diameter of ¾ inch, cutting length of ½ inch and and overall length of 1 ¾ inches with a diameter of ¼ inch.
Grizzly do a full range of bullnose router bits which includes all possible specifications that you might need.
Bosch ½ bullnose router bit has a ½ inch shank and are carbide tipped. Bosch claim that the micrograin carbide that they use in their router bits ensure a life which is 30% longer than standard micrograins but I can’t confirm this.