The Generation 3 Fiber Optic Front Sight from HIVIZ features 3 interchangeable LitePipes to fit your shooting demands. The steel base features the durability of the HIVIZ overmolded design with the versatility of the interchangeable LitePipes. Change the LitePipe with the included key and get back to shooting. Add this set to your favorite handgun to increase your hits on target and increase your fun! It's a lot more fun when you can actually hit what you are aiming at and HIVIZ has been helping shooters experience this for years. Gunsmith installation is recommended. Pipe diameter is .080". DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.