20-piece set: 9 screw tap: M3x0.5,M4x0.7,M5x0.8,M6x1.0,M7x1.0,M8x1.25,M9x1.25,M10x1.5,M12x1.75 9 round die: M3x0.5,M4x0.7,M5x0.8,M6x1.0,M7x1.0,M8x1.25,M9x1.25,M10x1.5,M12x1.75 1 handle screw tap wrench: M3-M12 1 round die stock: M25 Wrench holder is made of Zn alloy Screw taps and dies are made of high-quality carbon steel with 56-61HRC hardness
1. Wrench holder is made of Zn alloy 2. Screw taps and dies are made of high-quality carbon steel with 56-61 HRC hardness
