SPECS: Steel, blued, matte finish. 1911 Auto - Rear Blade: .695" (17 mm) x .440" (11mm). Notch: .125" (3.1mm) x .112" (2.8mm). Body: 1.04" (2.6cm) x .695". .8 oz. wt. 65° x .375" dovetail. Installation requires milling of slide. Glock - Rear Blade: .700" (17mm) x .250" (6.5mm). Notch: .119" (3mm) x .125". Body: .712" (18mm) x .727" (18.4mm), .6 oz. wt. Fits in all Glock factory dovetails.