SP Air 156mm Air Micro Grinder is slim, lightweight, durable and comfortable to use and hold. It provides high-speed rotation with variable speed throttle control up to 70,000rpm and extremely flexible 1.5m long hose. It is ideal for precision grinding welding surfaces, cleaning and polishing various metals and porting cylinder heads. Specifications: Length: 156mm, Capacity: 3mm (1/8inch), Air consumption: 0.14m3/m in, Rear air exhaust.