Master Lock 643D Set Your Own Combination Padlock, 1-9/16 in. Wide Indoor padlock is best used for cabinets and school, employee, athletic, and indoor storage lockers Set your own four digit combination lock for easy combination recall Small combination lock is constructed with a solid metal body and nickel plated steel shackle 1-9/16 in. (40 mm) wide lock body; 1/4 in. (6 mm) diameter shackle with 7/8 in. (22 mm) length, 7/8 in. (22 mm) width Shackle is preset to open on 0-0-0; for combination reset instructions, see User Manual in Technical Specifications section of this page