HPI Racing Hard Anodized Aluminum Knuckle Set – Optional Upgrade for WR8 / Bullet MT/STOverview The HPI Racing Hard Anodized Aluminum Knuckle Set is a premium optional upgrade for the HPI WR8, Bullet MT, and Bullet ST platforms. CNC machined from aluminum and finished with a tough hard anodized coating, these knuckles replace the stock plastic units with race grade durability. The aluminum construction provides increased strength for aggressive driving, while the hard anodized finish resists scratching and wear. Key Features Premium CNC