A wide range of Ferrea handles is available on the American and European market. We now offer four different types of retainers to choose from: titanium steel, lightweight steel, steel and aluminum retainers, all CNC machined to perfection and offering excellent strength and stability. Fits: NISSAN SKYLINE 6 CYL IN LINE - 24 VALVE - (RB26) - 1989-2002 Dimensions: Valve head diameter: 6 mm Diameter (A): 26.67 mm Outer step diameter (B): - Inner step diameter (C): 21 mm The wide range of Ferrea retainers is available on the US and European market. We currently offer four different types of retainers to choose from: titanium steel, light steel, steel and aluminum retaining components, all of which are CNC machined to perfection and offer excellent strength and stability.Fits: NISSAN SKYLINE 6 CYL IN LINE - 24 VALVE - (RB26) - 1989-2002Dimensions: Head diameter: 6 mmDiameter (A): 26.67 mmOutstep diameter (B): -Instep diameter (C): 21 mm