1/4"-20 x 3/4" UNC Indented Hex Head Type F Thread Cutting Screw Zinc Plated #491-053 - R. E. Glover Ltd.
1/4"-20 x 3/4" Indented Hex HD Thrd Cut F Screw PLTD #491-053
1/4"-20 x 3/4" UNC Indented Hex Head Type F Thread Cutting Screw Zinc Plated #491-053