Flexi-Overdenture ATTACHMENT Introductory Stainless Steel - Kits12 Overdenture Posts (6 Posts of 2 Sizes), 12 Nylon Attachment Caps, 2 Primary Reamers, 2 Countersink Drills, 1 Wrench, 1 Depth Gauge. The attachment can be placed without lab assistance providing a simple, inexpensive overdenture at chairside. The system may be used with the patented EZ Change keeper and cap insert system allowing, for "quick and easy" nylon cap replacement.