C630 Bronze.
Standard Size: 0.4750″ OD (12.07 mm); 0.2347″ ID (5.96 mm); 1.655″ OAL (42.04 mm).
C630 Bearing Bronze is a tough nickel-aluminum-bronze alloy typically used in high-performance and racing applications where rapid heat transfer from the valve to the head is important.
Fits:> 17-21 M8
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