Torque Solution fat head billet shift knobs are machined from 6061 Billet material and hard anodized to resist scratching and wear. These knobs are designed to fit reverse lockout-style shifters and do not require an adapter or locking nut. Each knob weighs 188g / 6.6oz to give you that more positive & smooth feel when shifting. Suitable for all forms of racing and guaranteed to last a lifetime.