1/4" x 4-1/4" Long. Titanium Micro-Carbide Diamond Ground. Fantastic in Granite, Marble, Stone, Concrete, Brick, Cast Stone, Soft Wood, Hard Wood, Ceramic Tile, Porcelain Baked Ceramic, Glass, Crystal, Plastics, Acrylics, Graphite, Cast Iron and even steel and stainless applications. Drills just about everything. Straight shank fits all drills and can be used with rotary and or percussion drills.