Contents:7 sleeves with 1/2" square 17, 18.5, 20, 21.5, 23, 24.5, 26 mm.For loosening damaged nuts. A must for the tire workshop, car workshop and field service technicians who can lose a lot of time on rounded nuts and bolt heads. This conical power sleeve is left-handed. This makes it possible to easily tighten it on the damaged nut/bolt head, which can then be loosened by continuing to tighten it to the left. An easy and convenient way to loosen damaged nuts and bolts. The sleeve can also be used for multiple lock nuts in cases where the original tool is not available.KraftTecos® power sleeves are manufactured in chrome-vanadium-mobyden steel. The quality standard corresponds to the norms of GGG-W660A and DIN 3121/3129 in terms of hardness, function and torque.