WH20 490P Fiber Shell Welding Helmet, SH10, Black, 490P, Quick Slide Front, 2 in x 4 1 4 in no checkout Cuts internal threads in pipes Nominal Cuts internal threads in pipes Nominal size of the tap is that of the pipe fitting being tapped Available in National Pipe Taper (NPT) and British Standard Pipe Taper (BSP) Ideal for pipe fittings Tapered at a rate of 3 4" per foot Two sided tag with warning messages and graphics Both sides have lines for writing additional information Write on polyester laminate protects the graphics heavy duty welding Made of 10% recycled fiber content Not suited for damp environments or overhead welding Quick slide filter plate holder is ideal for tight work environments Lightweight