Big Dot Sight Features Tritium powered front sight. Big Dot front measures 0.188. High-contrast colored front sight. Glow dot absorbs ambient light and glows in low light. Low-profile V rear provides greater visibility of front sight. Simple dot-the-i sight picture. Rear sight white stripe non-tritium. Rear sight ledge for one-handed slide manipulations. Durable CNC machined steel. 10 Year Warranty. 30 Day Satisfaction Guarantee. Fits standard holster options. Big Dot Sight Specifications XS Sight DXW2 Big Dot Sight for S&W 586 686 625 629 329 Revolvers Orange