Ted Yost developed and made these sights several years ago and after a long absence from the marketplace they are once again available from Harrison Design. These sights can be used to rescue a slide from mis-cut front dovetails. They have an oversize dovetail base featuring nominal dimensions of .085"" depth, .375"" width with a 65 dovetail angle. That's big enough to rescue most any sort of ugliness and butchery. The blade is .275"" tall X .630"" long X .125 wide. The vertical rill pin has been omitted so you can match it's location to wherever your slide's hole location is located. The dovetail base is .625"" wide, s Mfg: Harrison Design & Consulting