XFORT 4 Inch (100mm) Steel Fire Rated Internal Door Hinges, Satin Chrome Hinge for Fire Door, Ball Bearing Hinge for Internal Use in Residential and Commercial Buildings, Grade 11 (2 Pairs) by Amazon.co.uk

• FUNCTION: The bearings in ball bearing hinges reduce friction, which is especially helpful on heavier doors. This makes opening and closing a door consistently easier, smoother and quieter. The Grade 11 ball bearing hinges are to be used on doors weighing up to 80kg (includes door furniture) to protect from fire.

• APPLICATIONS: The ball bearing hinges have lubricated bearings between the hinge's knuckles to reduce friction caused by heavy doors. These durable hinges are ideal for heavy entryway doors or those that sustain frequent use in residential and commercial properties.

• FINISH: These butt hinges are constructed of mild steel with a contemporary satin chrome finish, deisgned to go with modern décor.

• FIRE DOORS: The hinges are fire-rated for timber doors. They must be fitted with intumescent pads (not supplied) to conform to fire testing regulations.

• FIXTURES AND FITTINGS: These ball bearing hinges are supplied with 32 colour matched screws with counter sunk holes that are designed to prevent accidental push through. The depth of their grooves allows a smooth flush finish.