Sway-A-Way’s Volkswagen/Porsche Wheel Studs are high-quality replacements designed to withstand the demands of off-road racing. All studs are manufactured from aircraft grade alloy steel, cold headed and all threads are rolled for maximum strength. Studs PN# 8030 and 8040 have starter leads for perfect nut alignment and quick tire changes. The thread measures 45 mm from under the head to the end of the thread.Installation requires a hole drilled and reamed to .562‚Äù diameter. Length is measured from under the head to the end of the thread.