The Astro Pneumatic 30045 ONYX 4.5” Compact Air Angle Grinder – 0.8HP is designed for 4.5” grinding discs with a 7/8” arbor hole (5/8”-11 thread size), offering versatility and compatibility. Despite its power, it boasts a compact size, measuring just 8.5” long, ideal for tight spaces. Featuring a convenient push-button spindle lock, the Astro Pneumatic 30045 ONYX 4.5” Compact Air Angle Grinder – 0.8HP ensures quick and easy disc changes. With 0.8 horsepower and a rapid 12,000 rpm, it delivers efficient performance for various grinding tasks. With over 40 years of importing product into the U.S. Automotive Aftermarket, Astro Pneumatic Tool Co. offers several product categories for one-stop shopping. Our products under our own brand name Astro Pneumatic include the popular tool and equipment classics, as well as innovative new items.