For lockrings, I prefer a lockring pliers, such as the VAR #16 or Hozan C-203, as this makes it easy to keep a firm grip on the ring. N.B. they only work for rings with an even number of notches. Also note that you can fabricate a good copy of the Hozan C-203 from a set of Channel Lock pliers and a little work with a grinder or file:
