"Sunex 6in. long torque limiting extensions are made of flexible spring steel that stops turning when the required torque has been reached. Set contains most popular sizes and torque ratings in the automotive service industry. Torque limiting extensions often extend the life of thin wall impact sockets by limiting torque to the required rating. Drive in. 1/2, Extensions qty. 5, Adapters qty. 0, Universal Joints qty. 0, Material Type Spring steel, Storage Type Plastic case, Pieces qty. 5. Includes 65 ft.-lb., 80 ft.-lb., 100 ft.-lb., 120 ft.-lb. and 140 ft.-lb. rated extensions Blow-molded case"