Description: Durable material: made of carbide alloy, strong and practical, not easy to rust, long time to use. Router bit set: containing bearings, set screws, lock ring,and hex key wrenches. Simple construction: nice operation. Provides much convenience to your daily woodworking. Small friction coefficient: precision bearing, specially designed for high rpm use on router bits. Powerful tool accessories: replace or repair the damaged or lost router bit bearings. Specifications: Product name: router bit set Type: A, B, C, D, E Material: carbide alloy Color: silver Size(approx.): type (bearing) inner diameter x outer diameter A 4.76 x 9.52mm/0.19 x 0.37inch B 4.76 x 12.7mm/0.19 x 0.50inch C 4.76 x 15.9mm/0.19 x 0.63inch D 4.76 x 19.05mm/0.19 x 0.75inch E 6.35 x 12.7mm/0.25 x 0.50inch Package Includes: (type A) 5 Pcs x Upper Bearing 5 Pcs x Screw 1 PC x Wrench or (type B) 5 Pcs x Upper Bearing 5 Pcs x Screw 1 PC x Wrench or (type C) 3 Pcs x Upper Bearing 3 Pcs x Screw 1 PC x Wrench or (type D) 3 Pcs x Upper Bearing 3 Pcs x Screw 1 PC x Wrench or (type E) 5 Pcs x Lower Bearing 5 Pcs x Bearing Ring 5 Pcs x Screw 1 PC x Wrench Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.