4 New Notching Pliers. Hole Punch Pliers. This is a new pair of hole punch pliers. These pliers are designed to punch smaller holes in many kinds of leather. It punches holes of approximately 2 mm in diameter. It measures approximately 5 1/4" (133 mm) 3 Notching Pliers. This is a set of 3 pliers designed to punch notches in many sorts of leather. Each measures approximately 5 1/2" (139.7 mm) in length and is designed for years of use. You receive: 1 pair of pliers with 2 mm notches 1 pair of pliers with 3 mm notches 1 pair of pliers with 4 mm notches.