All junction, back boxes and push-button boards are made of stainless steel AISI 304 (EN 1.4301) and AISI316L (EN 1.4404) with Scotch-Brite finish. Other types of steel and finish are available on request. This is the most versatile product for any usage or application: either on machine board or wall-mounted. The really large number of items in our catalogue (with plain or pre-drilled lids, low or high profile) covers each and every size request.