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