Wilson Combat #593, 1911 Battlesight Serrated Blade Black Minimal fitting required when used on any slide already cut for a 65 x.495" dovetail (Wilson 463/Novak Low Mount) The concave rear blade is serrated 40 lines per inch Machined external shelf profile enables one-hand slide cycling or malfunction clearance Dual Set Screws for a final Rock Solid Attachment Easy Fit on any slide cut for a 65 X .495" Dovetail (Wilson 463 or Novak Low Mount).