John 19:18 – There they crucified Him, and with Him two others, one on either side, and Jesus between them.
Jesus had two metal nails in His hands when He was being crushed by death.
Revelation 1:18 – I died, and behold I am alive forevermore, and I have the keys of death and hades.
After dealing with the issue of sin, Jesus has two metal keys in His hands; one for death and one for hades.