CP9106Q-B Chicago Pneumatic 1/4” 90 Degree Die Grinder The CP9106Q-B Chicago Pneumatic 1/4” 90 Degree Die Grinder was designed for general maintenance applications and is ideally for limited space applications. CP9106Q-B Chicago Pneumatic 1/4” 90 Degree Die Grinder features quiet and efficiency as there is a built-in regulator for greater power and performance as well as having high operator comfort. CP9106Q-B Chicago Pneumatic 1/4” 90 Degree Die Grinder features a rubber overmold grip and swivel air inlet, very similar to CP9105Q-B yet has about 23,000RPM instead and includes a 90-degree angle head.