Pyrotect QR101 Meets SFI 42.1 Specs with Lightweight aluminum spring loaded (pinless) hub design is splined to provide a snug fit and easy disengagement. Weld on style steel steering shaft adapter fits the common 3/4″ race type shaft for 3-bolt,5-bolt and 6-bolt type steering wheels. GM style adapter fits common saginaw splined column and 5-bolt style Pyrotect or similar type steering wheels.