Spyder 1/4-in x 3-1/4-in Pilot Bit

5 Times faster than traditional hole saw systems. Drop out the core at the push of a button. Application uses: wood, cement backer board, wall tile, concrete block, brick, plastic, MDF. Saves time, money, and eliminates the hassle of plug removal. Enlarge holes that are too small. Extend pilot drill length to cut at an angle. Durable tungsten carbide tipped pilot bit.