All tools are professional quality, made of high-grade chrome vanadium steel. Sockets feature SUPERTORQUE lobular openings for greater turning power without deforming the fastener. Packed in rugged high-density polyethylene (HDPE) cases that are strong and durable yet light in weight. Case is shock proof at both high and low temperatures, equipped with heavy-duty metal latches and hinges. Two-component handles are easy to grip and comfortable to carry.