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