Fits: (OD 0.75″ to 0.76″) Senco: SCN49XP, SCN49FRH, SN71P1, SCN49. Pneutools CN65Z, Grip Rite GRTCS250Z, Paslode tetraGRIP TG100CSN, Paslode CE20024, Metabo NV75A5 (tight fit), Designed to increase installation speed of popular engineered wood panels while meeting manufacturer’s specifications. Provides the correct nail placement consistently while reducing reliance on acute eye-to-hand coordination. - Allows variability in gun angle while still landing in the “best practices” fastener zone. - Spring loaded pin allows normal use of the nailer. - Anodized finish - Hex key included - Stainless steel set screws. EW gauge models are design to place nail 3/4" from edge. EW4 Fits: (OD 0.75″ to 0.76″) Senco: SCN49XP, SCN49FRH, SN71P1, SCN49. Pneutools CN65Z, Grip Rite GRTCS250Z, Paslode tetraGRIP TG100CSN, Paslode CE20024, Metabo NV75A5 (tight fit), *** Note: While other nail guns/nailers may be compatible, listed above are the only ones known to fit. *** Check WellsDesignToolco.com for up to date list of compatible siding nailers.