Safely set stones with minimum effort and maximum control. Gemsetting pliers close with a parallel motion so even pressure is applied when closing prongs and thus reduces the chance of damage to the stone. Jaws are easily adjusted by turning the opening adjustment wheel. 10:1 lever ratio allows you to set stones with less force than required with conventional pliers. The adjustment screw allows precise movement predetermined distance set by the jeweler. Works well with prongs and settings of all sizes and shapes. Easy to control and grip with the lever-action handle and limited travel distance. Simply adjust to fit the prong. Then gently squeeze to bend the prongs.