... 4.Suitabal for mounting various modular units 35/7.5 Terminal Block ChannelThis product is made from carbon constructional steel ... unperforatedDefault hole dimension: 6.2 mm x 15 mm on 25 mm center (Other dimensions upon request)Cold rolled steel (SPCC ... Rail is suitable to mount breaker, contactor, surge protector, relay, terminal, PLC, module socket, module appliance and favorable to circuit design ...