ARP Thread Chaser - 10 mm x 1.25 - 11 mm x 1.25 - and 12 mm x 1.25 Male Threads - Steel - Universal - (Set of 4) 42020BK Gun accepts a standard 14-oz

Gun accepts a standard 14-oz

This inertia weight has six (2-ring design) or eight (3-ring design) computer machined grooves to retain the proper durometer O-rings (dyno tested for each application)

The standard non perimeter seal Racing Optics tear offs are OK

Fuel Resistant Nitrile O-Rings Pack of 10

ARP Thread Chaser - 10 mm x 1.25 - 11 mm x 1.25 - and 12 mm x 1.25 Male Threads - Steel - Universal - (Set of 4) 42020BK Gun accepts a standard 14-ozProduct Description: Thread Chaser 8 mm x 1. 25, 10 mm x 1. 25, 11 mm x 1. 25, and 12 mm x 1. 25 Male Thread Steel Universal Set of 4 Since 1968, ARP is the fastener of champions and the world leader in fastener technology.