1.625″ Bore Diameter – Clamping Two Piece Shaft Collar – 303 Stainless Steel …
Strong, even clamping pressure around the shaft is created using the two included 5/16-24 x 1 stainless steel socket head screws. Compared to set screw style collars, the two-piece design has significantly higher clamping force and will not mar the shaft/pipe.