Grower Reaction® washer is part of a fastening system that provides a fully concentric dispersion of the reaction torque around and underneath the nut or bolt head to be tightened or loosened, avoiding the need of a reaction arm to generate the desired bolt preload.

Grower Detecto® is a smart sensorized washer for bolt monitoring, made of a smart sensor embedded in the washer. This system allows a live detection of the bolt loosening through an Electrical Mechanical Impedance method.