Ultimate Arms Gear Glock Original SP04204 Square Rear Sight 6.9mm .271" Height Steel Black White Outline 3/32 Pin Punch Gunsmith Tool Package Includes: Glock SP04204 + Ultimate Arms Gear Pro Disassembly 3/32 Pin Punch Armorers Gunsmith Tool Fits Glock Models: Most 9mm Luger, 40 S&W, and 45 GAP are 6.5mm (.256 in), Glock 17L models have a 6.1mm (.240 in) rear / 380 Auto, most 357 Sig, 45 ACP, 10mm are 6.9mm (.271 in), Glock 33 models have a 6.5mm (.256 in) rear. All factory Glock rear sights are interchangeable and elevation changes are made by switching out the rear sight (all factory Glock front sights are the same height). A shorter rear sight will lower the point of impact, whereas a taller rear sight will raise the point of impact. A one-step change (up or down) in rear sight height on a Glock 17 will result in approximately 2.4 inches of impact difference at 27 yards. Ultimate Arms Gear Pro Disassembly 3/32 Punch Armorers Gunsmith Tool Designed to Punch Pins. Features a Polymer Handle and Steel Tip for an Ultra Durable High End Tool. Diameter is 3/32 of an inch or 2.5mm.