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: 0.4 oz (13 g); No. 20 Pitch: 1.27 ; Number of threads: 47; Module: 0.40