By providing a guard

Providing plastic coating

By applying thin layers of oil

Provide a stand

Metric thread 20 mm diameter

Metric thread 20 mm length

Metric thread 20 mm pitch

Metric thread 20 mm lead

0.5 x pitch

0.6134 x pitch

0.6403 x pitch

0.75 x pitch

Support at fixed place of work

Support continuous entire length of work

It rotate with the work

It rotate and moves along the work

Support at one fixed place only

Support continuous entire length

It rotate with the job

It rotate and moves along the work