[3]: DESIGN – This quick-release pin is a kind of fastener connecting piece for quick locking, fastening, adjusting, and fixing, which can lock for frequent connections quickly and easily. The spring-loaded ball in the tip of the pin holds it in place.
[4]: ADVANTAGE – Made of carbon steel material. it is designed to be long-lasting, corrosion-resistant, rust-resistant, and wear-resistant. Galvanized surface, with an elegant appearance, not easy to fade and scratch.