The Little Blue Baby Pneumatic Water Fed Grinder/Polisher is an excellent high quality/low cost air powered machine for your grinding and polishing needs. Low Low CFM and high speed makes it an excellent grinding tool. It’s small design allows for a light weight handling with variable speed adjustment in the handle. Comes with an in-line oiler.. Does not include backer pads. Excellent for use with 4", or 5" 3M Hook and Loop disks