Able to drill into a range of materials including tiles, porcelain, ceramics and non-toughened glass.Blade tips manufactured from high quality YG6X tungsten carbide for prolonged life.Carbon steel hex shank ensures anti-slip tight fit into electric, hand and bench drills.Spear tip shape for precise alignment.Designed to fit any standard sized drill chuck.Contents: Ø3-10mm in 1mm increments.Model No. DBGC1APPLICATION - Designed to drill into a range of materials including tiles, porcelain, ceramics and non-toughened glass.STEEL TYPE - Blade tips manufactured from high quality YG6X tungsten carbide for prolonged life.HEX SHANK - Carbon steel hex shank ensures anti-slip tight fit into electric, hand and bench drills.PRECISION - Spear tip shape for precise alignment.COMPATIBILITY - Able to fit any standard sized drill chuck.CONTENTS - Ø3-10mm In 1mm increments.