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This collectioin includes 1 tie rod, 1 guide arm and 2 steering knuckles, which are frontend parts included in Chassis Kit CK5. All of these parts have one or more small diameter pins/posts, which if broken, render the chassis inoperable. They are vulnerable to being bent or broken during assembly or racing without a body, but very unlikely to break when protected by a body.
The guide arm can also be used in Chassis CK1, CK2, CK3, and CK4. The tie rod and steering knuckles of SP5 are not interchangeable with those in CK1, CK2, or CK3. The parts in SP5 are interchangeable with those in SP4.
The 4 parts can be separated easily with a sprue cutter.