"This 12-pc. 3/8in. drive metric universal standard impact socket set is made with chromium molybdenum alloy steel for strength and features a 12-point design for less fastener wear. Drive in. 3/8, Material Type Chrome molybdenum, Measurement Type Metric, Metric Socket Size mm 7-19, Specialized Pieces qty. 0, Pieces qty. 13, Point 12, Storage Type Plastic case. Universal joint helps reduce wear by working at off-angles"