If you’re just removing a link, you really don’t need anything more than a small flathead screwdriver. Buy a set with Ø 0.50, 0.60, 0.80, 1.00, 1.20, 1.40, 1.60, 2.00, and 2.50 mm, and you’ll have plenty to play around with. If money isn’t an issue, go for Bergeon.