This is a Hi-Viz Sight known as the Litewave, model RBLW01.
HIVIZ(R) LiteWave(R) Front Sight for Ruger Super Blackhawk revolvers. Fits Super Blackhawk" Blackhawk and Bisley models with pinned front sights; does not fit .45 Colt models. Includes Green" Red and White replaceable LitePipes.
Features:
Interchangeable Litepipe front sight
Includes green red and white LitePipes;.090 diameter
