British Standard Whitworth (BSW) high quality steel taps and dies. Split dies with machined lead-ins. Die holder features self-centring mechanism for straight and accurate thread cutting. Set includes dies and taps (taper & plug) in each size, tap wrench, T-bar tap wrench, die holder, thread gauge. Supplied in storage case.Model No:AK3028BSWContents:Taps (Taper & Plug) & Dies (BSW); 1/8" x 40, 5/32" x 32, 3/16" x 24, 1/4" x 20, 5/16" x 18, 3/8" x 16, 7/16" x 14, 1/2" x 12, Die Holder, Thread Gauge (BSW), T-Handle Tap Wrench, Tap Wrench