Simply45 Keystone Jack Closure / Seating Pliers for all keystone jacks. The Simply45 keystone jack setting plier provides a parallel motion that is designed to properly seat/close punch-down style and toolless keystone jacks. Unlike adjustable pliers, the S45-C370 provides the correct open/close ratio specifically designed to prevent damage when closing/seating a toolless keystone jack. The ultra-stable platform provides high-quality terminations with professional results.