These are 6.125 inch I Beam con rods with 7/16 ARP2000 fasteners for all Holden LS  / GM LS V8 Engines.Approx weight 665 gramsWe have customers making over 1000 RWHP with Spool ConrodsThese con rods are used in Goran's 1000 rwhp , 8.45 sec @ 164mph VL Commodore These con rods feature:High tensile 4340 forged steel2 Piece forgingHardness of HRC36-42Dowelled caps for precision alignmentX-RAY & Sonic testedQuenching and heat treatedShot peened100% MagnafluxedWeight Matched Sets + - 1 gramVacuum degassed to remove impurities.All Connecting Rods come with ARP 2000 rod bolts fitted.