The Wehrs machine newly re-designed non-slip aluminum pedals will supply comfort to any lead foot. The foot pedal slides on a hex shaft and the upright to the carb turns on a thread. When they are adjusted and tightened they will not slip. Smooth acceleration with the bronze bushing design and delrin toe rollers. This one fits straight firewalls, this fully adjustable throttle pedal will be a great addition to your hot rod.