Product details:

4 piece extra long rotary carbide tool bit set.

Carbide constructed burrs are perfect for accurately deburring and shaping quickly.
Great for shaping, metal removal, porting cast iron and steel, and for other ferrous metals. 
Great for high performance engine work.

Specifications:

• 3/8" X 3/4" Ball End Cylinder
• 3/8" Ball
• 3/4" X 3/8" Tapered Cone
• 1" X 1/2" Tapered Cone
• Includes Case
• 4 Different Shapes w/ 1/4" x 6" Long Shank
• Great for High Performance Engine Work
• 1/4" Shank