Mounting Bracket, Mount Type Flange, Material Cast Iron, Compatible with Grainger Part Number 4Z231, Compatible with Brand Gast, Compatible with Series 4AM Series, Includes (3) 1/4-20 x 0.50 Phillip's Head Screws, Standards RohS Compliant, Mount Hole Center-to-Center Width 2 1/8 in, Compatible with Manufacturer Model Number 4AM-NRV-92, Series Air Motor, System of Measurement Inch, Mount Hole Center-to-Center Length 2 1/8 in, Overall Width 1/2 in