5 x      Micrometals   T68-6   toroids. 

0.68" o/s diameter.

Toroid core for H.F. use up to 55Mhz+.  40 Watts, much more if two are stacked!

Very popular.  Ideal for Balun, Linear amp.,  A.T.U., P.A. LPF, antenna loading coil, 6m tx, etc.

Lots of design info on web.

For full specs. please visit micrometals website. http://www.micrometals.com/parts_index.html

Post and packing within the U.K. is £2.25 
(Europe £2.45, other, £2.95).  )    Free insurance.

See other components and tools at low prices in my e bay shop. Postal discounts given whenever possible, before checkout.