The 16mm x 16mm Steel (Black Oxide) Metric Two-Piece Clamp – Precision Sleeve Coupling with Keyway is precision-machined from durable steel with a black oxide finish for enhanced wear resistance, corrosion protection, and reliable performance. Its solid center section provides a close-tolerance fit on ground shafting, while the Accu-Clamp design features self-centering clamping collars for high clamping power and precise alignment, maintaining <.001" TIR concentricity while in use. The coupling completely separates for convenient assembly and adjustment, with a non-marring design that protects shaft surfaces.