We have Astro Pneumatic 1757 Air Spot Drill, 500 RPM with 5.5-Inch Deep Clamp Kit and 4 Drill Bits with Product Detail Specifications: Drill Bit Size Chuck Cap.: 5/16-Inch, Free Speed: 500rpm Overall Length: 8-3/4-Inch (222mm), Air Inlet Thread NPT: ΒΌ-Inch Air Hose I.D. Size: 3/8-Inch (10mm) Avg. Air Consumption.: 4cfm Air Pressure: 90-120psi . The "Astro Pneumatic 1757 Air Spot Drill, 500 RPM with 5.5-Inch Deep Clamp Kit and 4 Drill Bits" is best product for you. We recommended Astro Pneumatic 1757 Air Spot Drill, 500 RPM with 5.5-Inch Deep Clamp Kit and 4 Drill Bits