Prime-Line N 7439 Bi-Fold Door Knob &ndash; Wide Base and Large Diameter Door Knob For Easy Gripping, Replace Old or Unsightly Knobs, 1-11/16&rdquo; Outside Diameter, Diecast, Classic White REPLACEMENT DOOR KNOB  Replace old, unsightly or missing door knobs on your bi-fold doors with these classic white, large diameter door knobs. WIDE BASE  The wide base of this bi-fold door knob prevents crushing of a door panel when installed on hollow doors, and the large diameter allows for easy gripping. EASY INSTALLATION  Installation is quick and easy and everything needed is provided  1 door knob per package with 2 fasteners. These door knobs are used by many wardrobe door manufacturers. DURABLE  Made with zinc diecast construction and a classic white finish, these door knobs are strong, durable and made to last. SIZING  This door knob has an 1-11/16 outside diameter, 1-3/8 reach and 15/16 base diameter. Zinc die cast construction White plated finish Wide base prevent hollow door crush Large diameter for easy gripping