Improve better geometrical accuracy

Abrasives cut the lap instead of work piece

Improve dimensional accuracy

Refines surface finish

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