metal shell switch with separate operating head and elastic or electromagnetic internal locking SLM plastic shell by magnet locking safety switch SLK metal shell locking safety switch ENM2 GC model ENM2-AHz FBT series foot switch safety hinge switch SHS3 Model GC-VKS/VKW model I88 VKS/VKW Model I88-AHDB Safety hinge switch SHS Plastic case limit switch Model ENK plastic case limit switch Model Biggy