R634 - 4.50mm Optical Fine Cross-Hair Zone Marker
Diameter option: 2.50mm, 2.75mm, 3.0mm, 3.25mm, 3.50mm, 3.75mm, 4.0mm, 4.25mm, 4.5mm, 4.75mm, 5.0mm 5.25mm, 5.5mm, 5.75mm, 6.0mm, 7.0mm, 8.0mm 
115mm overall length