HL[2pack] SUS304 Hardware Commercial Grade 4 Ball Bearing Door Hinge 4.5 x 4 UL certification Hinges,3 hours fire-rated certified by UL. SUS304 stainless steel hinges,Stainless Steel Hinge 200,2000 cycles tested on 120kg door. Hinges with five knuckle four ball earing with non-rising pins with button tip and plug. All hinges have template screw hole location for using on either wood or hollow metal doors and frames