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: PRECISION TORX T5 X 1-1/2, T6 X 2, T7 X 2, T8 X 2-1/2, T9 X 2-1/2.