Hollon HS-530WD Home & Office Fire Safe MT5+ Interchangeable core cylinders how do they accomplish this

how do they accomplish this

UL Listed: No

Model: 86124

Privacy - 8220WM

Hollon HS-530WD Home & Office Fire Safe MT5+ Interchangeable core cylinders how do they accomplish thisHollon HS 530WD Home & Office Fire Safe Product Specs: External Dimensions 20 5 8H x 17 1 2W x 17 1 4D (Add 2 to Depth for Handle) Internal Dimensions 14H x 12 1 2W x 12 3 8D Cubic Feet . 1. 16 Weight 145 lbs Fire Rating 2 Hours at 1700 Degrees Security Features: 2 Hours of Certified Fire Protection at 1700 Degrees Thick Steel Construction on Door & Body Dial Lock 2 Active Rectangle Locking Bolts Fixed Hinge Side Bolts 30 Foot Impact Rated Bolt Down