The model 17 is an inside-the-waistband (IWB Holster) holster constructed with ultra-thin Boltaron thermoform material, allowing for ultimate concealment. Fits 1.75 (45mm) belt widths and comes with a heavy-duty, spring-steel clip that securely anchors the holster to a belt or trousers. Gun fit: Smith & Wesson M&P Shield Smith & Wesson M&P Shield 2.0