Allstar Performance Tire Siper - 6 Blade - Black 01211 it means that these are

it means that these are not suitable for open-top car racing or for karting

Blue Chrome

1" NPT inlet

providing air flow to cool the driver

Allstar Performance Tire Siper - 6 Blade - Black 01211 it means that these areGet more sipes per swipe! 6 blade push or pull style siper quickly and precisely sipe tires for better traction. Unit has adjustable sipe depth. Lightweight siper use standard utility blades and are constructed for heavy duty use. Specialty items for the Shop, Trailer and Track. The Allstar Performance brand offers thousands of hard to find, specialty items that cover many segments in the performance aftermarket. For over 30 years, customers worldwide