Precision grinding on all surfaces for precise drilling in wood. Can be used with most electric drills. Hexagonal shank. For cutting straight or angled holes in hardwood, softwood, end grain, cross grain and laminate panels. Package includes: 6 pieces / set of woodworking drill bits Size: Silver Specification: 100% brand new and high quality Material: High carbon steel Groove: vertical stripes Surface treatment: Titanium Size: 10mm 12mm 16mm 18mm 20mm 25mmmm Feature: Precision grinding on all surfaces for precise drilling in wood. Can be used with most electric drills. Hexagonal shank. For cutting straight or angled holes in hardwood, softwood, end grain, cross grain and laminate panels. Package includes: 6 pieces / set of wood drill bits