R Eye Material: SKS_2 (heat treated, polished finish) Size: Outer Diameter 0.7 x Thickness 0.2 x Hole Diameter 0.1 inches (19 x 6.4 x 4.8 mm); Weight: 0.5 oz (13 g); Number 50 Pitch: 0.50 Thread Count: 117 Module: 0.162