REINFORCED 3-sided High-Performance Handle is heat-stabilized and modified to provide excellent abrasion protection, impact resistance, and chemical tolerance. RUGGED TRI-ALLOY U.S. STEEL Blades are Vacuum heat-treated, balancing hardness and resilience for ultimate performance. SET INCLUDES: TORX T10 X 3, T15 X 3, T20 X 3, T25 X 4, T27 X 4, T30 X 4