The Novak dovetail tritium dot front sight for the Ruger SP101 revolvers with factory installed Novak sights. Purposely designed for high visibility, strength, and performance. The sight blade length reduces residue on the face of the sight when firing, allowing for a clear and concise focal point for target acquisition. Made from American preheat-treated 4140 steel, precision CNC machined in the U.S.A., and black nitride finish providing the ultimate quality and unmatched durability. The well thought out design complements the lines of any handgun, providing the ultimate form meets function. Fits the Novak .330" x 65Adeg degree dovetail cut on the SP101 revolvers that have a narrower cross section dovetail. Blade widths are .125" for all fronts with the exception of the Mega Dot Series which is .145" wide.