Secondary Operations are often needed for various reasons, depending on the product you are ordering and its intended use.

chamfer

Chamfer

countersink

Countersink

crossbore

Crossbore

endbore-drilled

Endbore Drilled

pointed

Pointing

metal threading on a wood piece

Metal Threading

rounded

Rounded

slotted

Slotted

taper

Taper

tenon

Tenon

wood thread

Wood Threading