This button head with knurled push is supplied without cap . This allows users to customize it with any compatible desired cap in order to support your operating functions. It provides an ergonomic interface for controlling your machines thanks to its knurled knob head. It is easily installed and replaced on compatible complete push button units and contact blocks via snap-fit assembly. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66. It makes it ideal for operation in harsh environments.