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The Triple X Billet Sprint Car Torsion Arms offer the least deflection of all the arms on the market today.They are CNC'd out of a single block of 2024 Aluminum. They are not bent to the correct geometry like a normal rear arm, omitting stretching of the grain, which inherently adds strength to the arm. There is lightening pockets on only the inside of the arm, so if any tire rub occurs, the inside of the tire is not chewed up.Like all XXX left rear arms, it measures 15" from center of torsion bar hole to end. 3 1/4" offset. So it bolts right into your car, replacing a regular arm.Complete with hardware. Black Anodized for a clean, professional finish.