"Spurs" cut cleaner, more accurate holes through hardwood * The chisel edge design is more positively angled and digs into the wood * Strong, durable bit lasts under heavy demand * 75% Faster than conventional method by easily attaching to 5/8-Inch or larger diam. bits for drilling & counter boring in one action * Great for patios, playgrounds, railroad ties, docks/ piers, and anywhere a recessed bolts is needed