MBS SHOP › 12380-B - MBS Matrix Axle Nut (ea.) - 12mm (7/16") Image 1 of 1 12380-B - MBS Matrix Axle Nut (ea.) - 12mm (7/16") $0.95 Matrix 12mm Axle NutReplacement axle nut for all 12mm Matrix Trucks and ATS.12 Trucks Get notified by email when this product is in stock. Sign up to receive news and updates. Quantity: Add To Cart Added! Matrix 12mm Axle NutReplacement axle nut for all 12mm Matrix Trucks and ATS.12 Trucks