Product Details

• Amazon Sales Rank: #11261 in Home Improvement
• Brand: Porter-Cable
• Model: 42188
• Dimensions: .40" h x 7.70" w x 8.60" l, .30 pounds

Features

• Generously sized 2 1/2-inch center hold fits larger bits
• Transparent plastic design won't block your view of workspace
• Compatible with Porter-Cable routers, models 100, 690, 9690, 691, and 693
• Weighs 4.8 ounces (shipped)
• Comes with one sub base; easy installation

Amazon.com Product Description
Ideal for working on inlays or routing edges and dadoes, this sub base features a generously sized center hole measuring 2-1/2 inches to accommodate larger bits. Unlike standard black bases, this model is made of sturdy, transparent plastic, so it won't block your view of your workspace. Existing screws from the router base also make for effortless, straightforward installation. The Porter-Cable 42188 sub base is compatible with Porter-Cable router models 100, 690, 9690, 691, and 693.

Customer Reviews

Sub Base makes edge & Dado routing easy!
I have made up my mind never to use 1/4" shank bits again. This posed a problem in that many 1/2" bits won't fit through the standard sub base. The large sub base permits easy bit changes, allows for the use of larger bits, and the clear plastic makes seeing the progress of your work much easier than the solid black standard sub base. In fact I purchased an extra base, the D-handle, installed the 2 1/2" sub base, and in combination, I've never routed edges and dadoes with such ease. Highly Recommended.

This Should Be Standard Equipment
Didn't take long after the purchase of my PC router that the base included would not do the job. Standard base would not accept a ½" round over bit. I thought about enlarging the hole someway but thought it might leave some burrs that would mark my wood. New base was the only solution. The base plate accepts the larger router bits I sometimes use just fine. The added bonus to the base plate is its clear design. This is a good plus when using the router as you can precisely get the bit on the wood by eyesight.

Clear router base plates should be standard on all routers produced IMHO.

A round piece of plastic.
One problem people have with the Porter-Cable router base is that the hole in the base is too small to accept some of the larger diameter bits that are now available. The hole in this base is larger than the hole in the standard base. However, the Porter-Cable bushings that work so well are fitted for the standard base opening.

It might as well be said that if you are at the skill level where you are using a router you are at the skill level where you can make this yourself. All that is needed is some 1/4 inch thick plexiglass and the ability to drill and countersink three holes. Get this if you want to avoid the hassle of making your own custom base.