Grade 11 ball bearing hinge, suitable for 30 & 60 minute fire doors up to 80kg, when used in conjunction with intumescent hinge pads. Suitable for 30 & 60 minute fire doors Doors up to 80kg Smooth ball bearing action Fixings included" Size L x W mm: 102 x 76 Knuckle Dia. mm: 12.5 Hole Dia. mm: 7.2 Thickness mm: 2.6 Knuckle Type: Ball Bearing Corner Type : N/A Material: Carbon Steel Finish: Polished ChromeSize 101 x 76 - 2 Pieces Timco Grade 11 Ball Bearing Fire Door Hinges - Polished Chrome in Silver