The Mercer Collection is a new contemporary line for Top Knobs. Each element in the collection stands alone with a unique look and detailing that only Top Knobs could achieve. The Mercer Collection has several new series: Europa series, Glacier series, Holland series, Oculus series, Quilted series & Tango series. Oculus Round Knob. Product Details: Collection: Mercer Shape: Round Material: Zinc Alloy Country of Origin: China Installation Required: True Ship Type: UPS Packaging Type: Small Package Measurements: 7/8 Inches Overall Length (in): 7/8 Projection (in): 0.94 Base Diameter (in): 0.5W Weight (lbs): 0.079 1 1/8 Inches Overall Length (in): 1 1/8 Projection (in): 1 Base Diameter (in): 11/16W Weight (lbs): 0.121 1 5/16 Inches Overall Length (in): 1 5/16 Projection (in): 1.13 Base Diameter (in): 0.75W Weight (lbs): 0.168