Firm and Durable: The left hand taps and tap holder are made of good strong alloy, they are durable and firm, anti-rust and anti-corrosion, not easy to break or bend. You can use the tools with confidenceHuman Design: The T-shape tap holder adopts human design, on which there is a knob which can adjust the direction of rotation. The handle surface has the anti-slip patterns, ensure you the stability to grip by hand.5 Sizes Available: The package contains 5 sizes of taps: M3, M4, M5, M6, M8. Essential sizes cprrespond well to daily use. Their sizes are accurate, you dont worry about misfitting with screws.Save Your Effort: The tap holder bar provides perfect hand support, allows you to pick up your forces to a point that you want. The tap holder shank is also removable, allowing you to clean or maintain it easily.Wide Range of Application: Tapping tools can be used on soft surfaces, e.g. wood, plastic , aluminum etc...They are not for high hardness materials.