With the installation of holes 8mm, 10mm, 12mm, 16mm, 19mm, 22mm, 25mm, 30mm, 40mm various series of metal button switches and lights. Self-locking, self-resetting, light-emitting type, waterproof type (up to IP67 level), explosion-proof function (up to IK10 level), ROHS type and other types.

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