Ace Steel Torx L Wrench Set is drop forged and heat treated for industrial and mechanical use that meets and exceeds tough applications Made from high-grade chrome vanadium steel Black oxide finish for higher rust resistance Precisely sized, chamfered, straight ends offer a snug fit and insert smoothly into fastener head, reducing wear Long and short arm design offers extended reach on one end and extra leverage on the other 9-piece metric star key size range from T10-T50