It includes 1 piece wrench and 10 pieces screw dies. Size: M6x1.0; M6x0.75; M7x1.0; M8x1.0; M8x1.25; M10x1.0; M10x1.5; M12x1.25; M12x1.5; M12x1.75. Adopting bearing steel, which is durable and has long service life. Wrench Body: 206mm Long x 42mm Width.Clamps: 25mm (1") Round Dies. Ideal for thread processing and tapping by hand in machine manufacturing.