1-1/2"-6 UNF/UNC Threaded Shaft Collar One-Piece Split Clamp-Type, SSFit standard UNF UNC threaded shafts Superior holding power over set screw type collars Offered in High Strength and Low Profile styles UNF UNC 1 Piece Threaded Collars are used on standard threaded shafts, either UNF (fine thread) or UNC (coarse thread). They are precision machined, non marring, easy to adjust, with high clamping power. Stocked in: Steel Stainless Steel Specifications Part Number 4S108 Series Signature Material Stainless Steel Alloy