sourcing map Ferrite Ring Iron Force Toroid Core Yellow White 8.2 x 15.5 x 6.2 mm Pack of 50 sound it means the connection is

it means the connection is successful

Snap-in Insert Module (F/F) (P164-000-KJ-WH)

54mm Straight Single Row PCB Board Female Pin Header Socket Connector Strip Assortment Kit for Arduino Prototype Shield

the screw diameter: 4

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sourcing map Ferrite Ring Iron Force Toroid Core Yellow White 8.2 x 15.5 x 6.2 mm Pack of 50 sound it means the connection issourcing map Ferrite Ring Iron Force Toroid Core Yellow White 8. 2 x 15. 5 x 6. 2 mm Pack of 50 Description: This is a ferrite ring, not a magnet. It has no magnetism. The iron powder core is generally stored near location signals. It has the properties of isolating eddy current, has low permeability and suppress interference. Widely used in power transformers, current transformers, measuring transformers, inductors, chokes, ballasts, voltage