Fractional Size (in.)

Decimal Equiv. (in.)

Length overall (in.)

Length of Flute (in.)

Morse shank No.

1/4

.2500

6

1-1/2

1

9/32

.2812

6

1-1/2

1

5/16

.3125

6

1-1/2

1

11/32

.3438

6

1-1/2

1

3/8

.3750

7

1-3/4

1

13/32

.4062

7

1-3/4

1

7/16

.4375

7

1-3/4

1

15/32

.4688

7

1-3/4

1

1/2

.5000

8

2

1

17/32

.5312

8

2

1

9/16

.5625

8

2

1

19/32

.5938

8

2

1

5/8

.6250

9

2-1/4

2

21/32

.6562

9

2-1/4

2

11/16

.6875

9

2-1/4

2

23/32

.7188

9

2-1/4

2

3/4

.7500

9-1/2

2-1/2

2

25/32

.7812

9-1/2

2-1/2

2

13/16

.8125

9-1/2

2-1/2

2

27/32

.8438

9-1/2

2-1/2

2

7/8

.8750

10

2-5/8

2

29/32

.9062

10

2-5/8

2

15/16

.9375

10

2-5/8

3

31/32

.9688

10

2-5/8

3

1

1.0000

10-1/2

2-3/4

3

1-1/16

1.0625

10-1/2

2-3/4

3

1-1/8

1.1250

11

2-7/8

3

1-3/16

1.1875

11

2-7/8

3

1-1/4

1.2500

11-1/2

3

4

1-5/16

1.3125

11-1/2

3

4

1-3/8

1.3750

12

3-1/4

4

1-7/16

1.4375

12

3-1/4

4

1-1/2

1.5000

12-1/2

3-1/2

4