Centre drills

Type A

Type B

Spec

Unit

Old

New

Spec

Unit

 Old

New

Overall length

Flute length

Overall length

Flute length

Overall length

Flute length

Overall length

Flute length

0.8

Pc

31.5

1

31.5

0.9

1

Pc

35.5

1.9

35.5

1.3

1

Pc

31.5

1.9

31.5

1.3

1.5

Pc

45

2.8

45

2

1.5

Pc

35.5

2.8

35.5

2

2

Pc

50

3.3

50

2.5

2

Pc

40

3.3

40

2.5

2.5

Pc

56

4.1

56

3.1

2.5

Pc

45

4.1

45

3.1

3(3.15)

Pc

60

4.9

60

3.9

3(3.15)

Pc

50

4.9

50

3.9

4

Pc

67

6.2

67

5

4

Pc

56

6.2

56

5

5

Pc

75

7.5

75

6.3

5

Pc

63

7.5

63

6.3

6(6.3)

Pc

80

9.2

80

8

6(6.3)

Pc

71

9.2

71

8

 

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