I went with these to get a more target style sight system on my Scandium frame S&W 1911PD commander . .295" rear height and a .125" notch. The front sight is .160" tall and .100" wide. I can see thise window perfect and I'm scoring 29/30 from 25 yards consistently. Great sight system. Leaves just a bit of the foreign pin cover washer exposed due to the sight width at the base. This doesn't effect functionality, and sights are hard to find, so I'm ecstatic. I recommend investing in a set of calipers so you know what you have currently and help you adjust to perfect.