Pt paper tape series smooth shank clipped head 33 nails fuel profile smooth smooth shank nails have exactly that a smooth appearance due to their regular form they can be produced at very high speed and are therefore the most economical type of nail however their holding power is the lowest of the group they require less energy to drive them and the air consumption per nail can be lower sometimes it is possible to use a smaller tool to drive them finish plain plain finish is without any form