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Heim End Jam Nuts available in Aluminum in all sizes. 3/16"-5/8". (Some 3/4" in stock-call for availability). Nuts are notched for left hand thread. Large O.D. nuts available in 5/8" for rear arms.
New at SpeedMart---Black Anodized Version of the jam nut in stock! 5/8" only (sprint car size)