Atoplee 4pcs Titanium Deburring Tool Countersink Bit for Steel Wood Material: High speed steel 4241 Size(four type): 2-5mm,5-10mm, 10-15 mm, 15-20mm Length:2-5mm: 4.5cm; 5-10mm: 4.7cm; 10-15mm : 6.2cm ;15-20mm: 8.2cm Package Included: 4 x Countersink and Deburring Tool This 4 piece Countersink and Deburring Tool Set is ideal for cutting through metal, wood and plastic. round shank that accommodates most drill chucks