Master Lock No. 410KA Safety Lockout Locks: Master Lock 410KA Locks, Lightweight Engineered Zenex Thermo Plastic Padlocks with Stainless Steel Shackle for Lockout Tagout Applications. Choose Color: Orange, Blue, Green, Red, Yellow, Black, Teal or Purple. Keying: Keyed Alike (KA); Choose Shackle Height: 1-1/2" or 3-Inch Tall.