This Longacre Quick Release Hub has a precision fit splined hub for better steering control. Any play in the steering - including the hub - takes control away from the driver letting the car 'wander around'. This Quick Disconnect release hub has a precision machined 4130 spud and a T6 Hard Anodized splined hub for a super tight fit, yet easy to remove and install.There are multiple sets of mounting holes so you can 'clock' your wheel 3 times closer. For safety, there are 2 sets of retaining grooves. If you don't get the ring engaged it will catch on the second safety groove rather than come off on the track. The steel 'spuds' can be installed on 3/4" or 5/8" shafts. The product also includes a splined hub - pull ring release with double safety grooves on weld-on SAE 4130 spud, and 3 Mounting holes – 5mm on a 44.0mm bolt circle.