1/4&rdquo; Shank, Long Shaft Rotary Burr Bits (4 Piece Set) Includes: 4 Common Burr Shapes Cylindrical Radius End: 3/8 x 3/4 Ball Shaped End: 3/8 Tree Shaped Radius End: 3/8 x 3/4", Tree Shaped Radius End: 1/2 x 1 All Burrs are 6 Long with 1/4 Shank, Complete with Storage Case