99-007-F Inside Corner Pipe Holder INSIDE CORNER PIPE HOLDER with slotted holes for various wood thickness. Use with 99-004-F Outside Corner or Outside Corner Connector Hinges. All Floating Dock Hardware is 1/4" Hot Dipped Galvanized Steel. 9/16" hole punches are on 3 1/2" centers except where included. Slot sizes are 9/16" x 15/8" except where indicated. All Male and Female Connecotrs have a 3/8" tab with a 7/8" hole to fit a 3/4" Pin or bolt.