Shaft Collar, Dimension Type Standard, Collar Style Clamp, Number of Pieces 2, Bore Dia. 7/8", Material Aluminum, Outside Dia. 1-5/8", Width 3/64", Clearance Dia. 1.937", Screw Size 1/4"-28, Screw Material Steel, Operating Temp. Range -40 Degrees to 220 Degrees FFeatures:Material -Aluminum Outside Dia. -1-5/8" Width -3/64" Clearance Dia. -1.937" Screw Size -1/4"-28 Screw Material -Steel Operating Temp. Range --40 Degrees to 220 Degrees F WARNING: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.