Name: oblique hole machine (2-5， 5-10， 10-15， 15-20)Petiole: round handle.(suitable for using in hardness under 25 artifacts，such as aluminum， insulation board， PVC board) SpecificationSize:2-5 (pour 2 MM - 5 MM hole， 6 MM， head diameter 9.7 MM)5-10 (down 5 -- 10 mm range of hole， 8 mm， head diameter 14 mm)10-15 (10 mm - - 15 mm hole， a 10 mm， leader 21 mm in diameter)15 to 20 (15 mm - - 20 mm range of hole， handle 12 mm， leader of 28 mm in diameter)Color:show as picture.Material: high speed steel 4241Package include4Pcs Drill.