D-Loop Pliers by Viper.
Probably the best D-Loop pliers on the market! The pliers rests on three points on the string when the D-Loop is tightened. This allows a high force to be applied without damaging the string or serving. The claws are chrome plated and have a very smooth surface, this also ensures that the string is not damaged. The rubberized handles provide good grip and the pliers are comparatively small and compact.
Overall, a well thought-out product - if you ever use it, you will not want to use anything else!