Holy Orders is a sacrament of Service. The action of Holy Orders is laying on of hands, with a prayer asking God to give the powers and ministry of a bishop, priest or deacon.
Bible References
Matthew 10. 1-4 The Twelve apostles John 13. 1-14 Jesus Washes The Disciples' Feet
The mitre is what a bishop wears.
This is what the priests use to give out the bread and wine.