Router Cutter Bearings 3/16" x 3/8" x 1/8" inch Lot of 10 Bearings Router Cutter Bearings, the inner diameter is 3/16" inch, outer diameter is 3/8" inch and the width is 1/8" inch, this is a popular size Use On Router Bits, Machine Tools, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.