Brass Core Plug Set or sometime called a Freeze plug set, for a Triumph TR250 Triumph TR6, Triumph GT6. The advantage of this non-ferrous metal is that it improves resistance to corrosion. By purchasing this set will give you all of the freeze plugs for the cylinder head and engine block. Includes plug for the rear of camshaft. Contains 1 x 1 5/8 Cup,4 x 1 1/4 Cup, 1 x 1 Cup, 6 x 1 1/2 Cup,1 x 2 Cup.