Norsso P365XL Spec Ops Slide Black. 125 in Width: 1 in Height: 1.375 in Fabric/Material: Stainless Steel Features of Norsso P365XL Spec Ops Slide Optic mount thread pitch: M4 x 0.7 Fully enclosed slide no cosmetic/functional porting Package Contents: Norsso P365XL Spec Ops Slide What firearm models does the manufacturer say Norsso P365XL Spec Ops Slide is compatible with? The manufacturer says that Norsso P365XL Spec Ops Slide is compatible with SIG Sauer P365 XLNorsso N365XL-SOPS-507K-BLK: P365XL Spec Ops Slide Black