MLCS Router Bit Bearing Guides have totally enclosed ball bearings.

Features:

• Calculating Bearing Size for Desired Depth of Cut:
• Bearing Outer Diameter = Large Diameter of Bit - (2 x Desired Cut Depth)

Specifications:

• (B) Inside Diameter: 1/4"
• (A) Outside Diameter: 3/8"
• (C) Bearing Height: 1/8"

Note: By replacing your router bit's bearing with a bearing that has a smaller or larger Outer Diameter, you can achieve a different depth or profile.