ARP NASCAR Speed Nuts Lug Nut Kit - Fine Thread 5/8-18 - (10 Pack) 4704323-20- XL The pressure on the head

The pressure on the head from the earmuffs can be adjusted by changing the special foam rubber pads (supplied) positioned between the earmuff and the helmet

1 certified and FIA 8858 approved

Never requires free-air calibration when used with an AEM Controller and connector plug

All racing harness sets are designed to be mounted in a race vehicle to a rollcage or harness bar - if you do not have either

Includes air line and all necessary attaching hardware

ARP NASCAR Speed Nuts Lug Nut Kit - Fine Thread 5/8-18 - (10 Pack) 4704323-20- XL The pressure on the headDesigned for professional racing environments where split second improvements in pit stop times can make the winning difference, and reliability is an absolute must. ARP Speed Nuts feature a profiled nut face for easy installation, quicker socket releases and resistance to jamming. They are made from premium heat treated chrome moly that nominally rated at 190, 000 psi tensile strength, shot peened to remove stress risers and double magnafluxed after