Woodpeckers had a special on phenolic 6” clamping squares and I ordered 2. However, when I received the squares they had some problems. The outer faces had “ripples” that looked similar to planer snipe (CNC snipe?). When placed face-to-face there was a lot of daylight.
I eMailed Woodpeckers and explained the problem, and included a picture. They called me and apologized, and send me 2 machined, solid aluminum, made in the USA, 6" precision clamping squares - http://www.woodpeck.com/clampingsquare6.html .
Thank you Woodpeckers.
Larry