NiTy Memory Staple Features & Benefits The NiTy Staple was designed for ease of use and intraoperative stability. Generally indicated for Hand, Foot and Ankle joint arthrodesis, bone fragments, and osteotomies. 17 Standard sizes including 6 step sizes (6mm, 9mm, and 12mm). Sterile implant for convenience. Minimal surgical steps for a rapid implant and accurate placement. Shape Memory NiTiNOL