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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 CK6. 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 of SP6 can also be used in Chassis CK1, CK2, CK3, CK4, and CK5. The steering knuckles of SP6 are not interchangeable with those in CK1, CK2, or CK3 but they can be used with CK4 & CK5. The tie rod of SP6 cannot be used with any other chassis kit.
The 4 parts can be separated easily with a sprue cutter.