Master Lock 2 in. H x 1-1/4 in. W x 2-1/2 in. L Steel Dual Ball Bearing Locking Padlock 1 pk, Count of: 1 - Ralphs
![Extreme Safety : Master Lock® 575DPF Square Safety Padlock, Different Key, Brass Body, 9/32 in Dia Shackle, Brass, 5-Pin Cylindrical/Dual Ball Bearing Locking Mechanism Extreme Safety : Master Lock® 575DPF Square Safety Padlock, Different Key, Brass Body, 9/32 in Dia Shackle, Brass, 5-Pin Cylindrical/Dual Ball Bearing Locking Mechanism](https://cdn.extremesafety.com/assets/dam/Original/115/Master_Lock_575DPF.jpg)
Extreme Safety : Master Lock® 575DPF Square Safety Padlock, Different Key, Brass Body, 9/32 in Dia Shackle, Brass, 5-Pin Cylindrical/Dual Ball Bearing Locking Mechanism
![LockPickingLawyer on Twitter: "I vaguely remember reading that the American Series 10 was the first production lock with a ball bearing locking mechanism… but I can't find a citation. Can anyone out LockPickingLawyer on Twitter: "I vaguely remember reading that the American Series 10 was the first production lock with a ball bearing locking mechanism… but I can't find a citation. Can anyone out](https://pbs.twimg.com/media/FsMq19oXwAAu_Dp.jpg:large)