1/4″ Shank Carbide Nugget Burrs. by Mastercarver® High-performance tools! These burrs remove wood fast, leave the surface smooth, resist clogging, yet last longer than others we’ve tried! They feature super-tough nuggets of wear and impact resistant Tungsten Carbide, permanently brazed to the steel body. These “nuggets” of coarse carbide grit are more durable than the pointed carbide used on others. The result is fast cutting, plus amazing resistance to loading. Perfect for all shaping uses; in forward or reverse rotation. 1/4″ (6.3mm) shank, head diameter: 7/8″ (23mm), overall length: 2 1/8″ (55mm). COARSE grit, GREEN. Usage note: This shape is popular with gourd artists for cleaning inside the gourd.