Shaft Collar, Dimension Type Standard, Collar Style Clamp, Number of Pieces 2, Bore Dia. 3/4", Material Aluminum, Outside Dia. 1-1/5", Width 3/64", Clearance Dia. 1.812", Screw Size 1/4"-28, Screw Material Steel, Operating Temp. Range -40 Degrees to 220 Degrees FWARNING:California ResidentsThis product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm.Feature: Outside Dia.: 1-1/5 Width: 3/64 Clearance Dia.: 1.812 Screw Size: 1/4 Screw Material: SteelOperating Temp. Range: -40 Degrees to 220 Degrees FCalifornia proposition 65 warning