4 Piece Universal M4 Screw Connecting Bolts & Sleeves for Door Handle Roses and ESCUTCHEONS Nickel Color. These nickel plated steel screws with sleeves are used to fasten door handles, knobs, roses, and escutcheons. They are ideal for replacing existing or damaged screws that attach two handles together and are suitable for doors 35-60 mm thick. To install, drill a hole through the door leaf, place the door handle to align with the hole, and insert the screw through the door handle and leaf. Attach the sleeve and tighten. This process should be repeated for all four holes in the door handle for a secure fixing. Manufacturer: VINLIN