Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand - M20x1Meet the Wiseman Threading Tools Second Lead Metric HSS Tap Left Hand M20x1, a precision made tap engineered for dependable reverse threading in metalwork. Crafted from high speed steel and ground for exacting thread form, this uncoated tool is built for general purpose use across a range of materials while complying with ISO 529 dimensions. Why this left hand, two start tap excels Left hand thread capability: Creates reverse threads when your design