Master Lock 1177D ProSeries Combination Lock, Brass Indoor and outdoor padlock; maximum security lock with Tough-Cut octagonal boron-carbide shackle is best used for commercial and industrial applications Lock is constructed with shrouded solid brass body for superior corrosion resistance, octagonal boron-carbide shackle with shrouded feature for maximum cut resistance Set your own 4-digit combination for convenience and security, no reset tool required; Large ergonomic dials with exclusive blind dial feature permit operation with gloves, in low light or complete darkness Deadlocking mechanism protects against prying, shimming and rap attacks; Shackle seal and dial dust cover protect internal components and dials for trouble-free operation 2-1/4 in. (57 mm) wide lock body; 3/8 in. (10 mm) diameter shackle with 1-1/16 in. (27 mm) length, 15/16 in. (24 mm) width