@7bcc0e3c A quartet of pliars 😛 

 @7bcc0e3c 

What do you call two Filipino pilots?  A pair of pliers!

(The joke only works if you know the Filipino accent.) 

 @7bcc0e3c Four Plieces? 

 @7bcc0e3c Pairs of Pliers 

 @7bcc0e3c two pairs of pliers. Also works with shoes and other objects sold in twos. It's really not that hard. 

 @7bcc0e3c 2 pair of pliers.

Each arm is a plier. 

This is not difficult.