1-1/2", Laminated Padlock With Stainless Steel Shackle For Superior Cut & Weather Resistance, Laminated Steel Body With Yellow Weatherproof Cover, Protects Lock From Extreme Elements, 3/4" Shackle, 3/8" Shackle Diameter, Uses Master Lock Key Blank K1 Box Or Ilco Blank M1 TV #320-952.