Vibrant Performance VanJen Clamp Ferrule 2.5 in OD Tubing O Ring Included Pair 00131607RSNR 97 05 GM Car REM3026 97 05 GM Car Features:Must be used with an MSD Ignition ControlPolished steel shaft is QPQ coated and guided by a sealed ball bearing for smooth operation at all rpmsMaintenance free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm rangeCNC machined billet aluminum housing and billet aluminum base providing superior strength and great looksEasy to adjust mechanical advance with supplied springs and stop bushings (except locked out versions)Advance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reductionAdvance weight pins are staked and tig welded to the plateNylon pads ensure smooth operation of the advance weightsMechanical advance assembly can be locked out for crank trigger systems or racing applicationsVacuum advance canister for improved economy (can be locked out) Stainless Steel Weld Ferrules with O Rings for 2 a Truck or even a Motorcycle