New Tuning Haus 4Mm Aluminum Locknut-Flanged Knurled 8 Dark Blue Tuning Haus aluminum locknuts are made from a superior aluminum alloy and feature a high-quality nylon insert to secures the fastener to the screw, stud, or axle. Knurled versions securely grip to... MSRP: Was: Now: $41.39 Add to Cart