You're a Sap

"Sneaky Saps"

The "Palm Sap" was a cylinder of lead encased in leather and had a strap so you could secure it in your palm with the strap going around the back of your hand. Invisible at night for sure. Some Police Officers used to simply love these types of Saps because when used in front of other "Tough Guys," because it looks like someone being knocked out by being slapped open handed. If the Officer kept the "secret" well, he would develop a reputation on the street of being able to knock someone out by slapping them upside the head. The best way they were used was in a crowd of people causing trouble, taking out the Big Mouth in the group.