IKSACE E3Z-R61 Photoelectric Beam Sensor Indoor Wall Mounted NPN (NO Or NC Switchable) Retroreflective photoelectric Sensor Proximity Switch with 2M Cable,Reflector Panel, Pack of 2 2 pieces Size:2 pieces Premium C3 micro-grain solid tungsten

Premium C3 micro-grain solid tungsten carbide for an industrial quality tool with ZRN coating for increased durability

3mm Metal Wavy Wave Crinkle Spring Washers 100pcs

Made of 304 stainless steel (no coating outside) 18-8 which is superior to regular steel and any zinc plated fasteners

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IKSACE E3Z-R61 Photoelectric Beam Sensor Indoor Wall Mounted NPN (NO Or NC Switchable) Retroreflective photoelectric Sensor Proximity Switch with 2M Cable,Reflector Panel, Pack of 2 2 pieces Size:2 pieces Premium C3 micro-grain solid tungstenIKSACE E3Z R61 Photoelectric Beam Sensor Indoor Wall Mounted NPN (NO Or NC Switchable) Retroreflective photoelectric Sensor Proximity Switch with 2M Cable,Reflector Panel, Pack of 2 Explanation on the definition of NO, NC, NPN, PNP: NO(Normally open): the circuit is open when there is no sensing object, and the circuit is closed after sensing the objectNC(Normally closed): the circuit is closed when there is no sensing object, and the circuit is open