Transform your strength workouts with the Jammer Arm Upgrade Attachment, a diverse tool for unlocking a more complete range of strength exercises. This cutting-edge upgrade enables you to target different muscle groups with precision, whether you re into powerlifting, bodybuilding or functional fitness. Compatible with the PR-4, SM-25 and SM-26 power racks, you ll enjoy our high-quality materials, superior padding and black powder coating for the ultimate professional finish.