Supertech valve safety devices.Newly redesigned and now fully CNC machined for a higher quality and finer finish.Fits: NISSAN SKYLINE RB20 24v DOHC / HYDRAULIC LIFTER / Skyline RB20 DET 6Cyl / 24vReferences: Supertech valve locks. Newly redesigned and now fully machined on CNC for higher quality and more accurate finish.Fits: NISSAN SKYLINE RB20 24v DOHC / HYDRAULIC LIFTER / Skyline RB20 DET 6Cyl / 24v