Set Includes 1", 7/8", 3/4", 5/8", 1/2" & 3/8" Sizes * Cutting spurs on the edge of the bit score the outer edge of the hole before the cutting edge removes the material. * Great for plumbers, electricians and HVAC contractors. Use in materials including hardwoods, composites, treated lumber, railroad ties and other wood products * All 6? spade bits have 1/4? hex shank * RapidFeed bits leave cleaner, smoother hole with reduced splintering and less breakout at the back of the material