O to 17

1 to 17

0 to 18

1 to 18

5, 7 and 9

7, 9 and 11

9, 11 and 13

11, 13 and 15

1:10

1:15

1:20

1:25

only if the job is held between centres

only if the job is held in a collet

whether job is held between centres or in a collet

none of the above