Flat 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 24 pitch: 1.05 threads: 57 module... 0.34