Two cutting edges spaced 180 degrees apart, each half the length of its flute. One extends from the tip to the middle of the flute, The other from the middle to end. The configuration combines the cutting speed and chip clearance of a single-flute bit with the finish of a double-fluted bit. Excellent bit for cutting dense or abrasive man-made materials and panel goods, #51310, diameter (D) 1/2, cutting Height (B) 2-1/4, Shank (D) 1/2, overall length (L) 4-1/2, flutes stagger, 51310 carbide Tipped stagger tooth plunge 1/2 dia x 2-1/4 x 1/2 inch Shank