Climax Metals LC-050X20 Steel Set Screw Collar with 1/4"-20" x 3/16" Set Screw, Lightweight Zinc Plating, 1/2" Bore Size, 7/8" OD (Pack of 20) Setscrew shaft collar for applications supporting low axial loads and simple positioning Lightweight design for limited-space applications Steel for weldability and rust resistance with zinc plating for better resistance to corrosion than black oxide steel Includes a socket setscrew for securing the collar onto the shaft Operating temperatures range from -17 to 121 degrees C (0 to 250 degrees F)