General description 4pcs Titanium Coated Countersink Chamfer Tool Deburring Tool Set is designed for precision cutting in various materials including metal, wood, plastic, and thin iron plates with a hardness of less than 25 degrees. The set includes tools that create neat and accurate countersinks with a 90-degree angle tip, suitable for circular opening chamfering or tapered holes. Technical specifications Material: HSS (High Speed Steel) 4241 Titanium Coated Chamfer Range: 2-5mm, 5-10mm, 10-15mm, 15-20mm Shank Diameter: 6mm, 8mm, 10mm, 12mm Head Diameter: 10mm, 14mm, 21mm, 28mm Installation Recommended to use with a bench drill for optimal performance. Using a hand drill may cause shaking, affecting the chamfering effect.