High carbon steel for hand tapping applications. Tap size and recommended drill bit size are etched on each tool for easy identification. Hexagon dies are best suited to maintenance and repair work. Plug taps are ideal for general purpose threading . Comes in a plastic case Set includes: Metric Plug Tap and 1" Hexagon Dies in sizes: 3mm-0.50, 4mm-0.70, 4mm-0.75, 5mm-0.80, 5mm-0.90, 6mm-1.00, 7mm-1.00, 8mm-1.25, 9mm-1.00, 9mm-1.25, 10mm-1.25, 10mm-1.50, 11mm-1.50, 12mm-1.50, 12mm-1.75; metric plug tap and 1-7/16" hexagon dies in sizes: 14mm-2.00, 16mm-1.50, 16mm-2.00, 18mm-1.50, 18mm-2.50; pipe thread plug tap and 1" hexagon dies in sizes: 1/8"-28 BSP, 1/4"-19 BSP; threading tools: adjustable die stock - 1" dies, adjustable die stock - hexagon dies, T-handle wrench - taps No. 0 to 1/4", T-handle wrench - taps no. 0- to 1/2", adjustable handle tap wrench - taps no. 1/4" to 1", 16 leaf metric thread pitch gauge.