Woodpeckers 641 and 851 Precision Woodworking Squares Mounting Angle 4-Post Bed Support – Provides

4-Post Bed Support – Provides precise and consistent performance with every cut

Cutterhead Diameter: 3-7/8"

For precisely cut radii (with diameters from 3/4 [20] to 7-5/8 [193

Retractable sky hook for added convenience

Woodpeckers 641 and 851 Precision Woodworking Squares Mounting Angle 4-Post Bed Support – ProvidesPerfect Full Time Shop Companions The previously mentioned "0. 0085" isn't a goal, it's a guaranteefor life. If you ever find your square outside that tolerance, well fix it or replace it. To put that angular tolerance in perspective, on the 641 the far end of the 6" blade would be out by less than half the thickness of a human hair at the maximum allowable variance. The scales on the 641 and 851 are laser engraved to a tolerance of . 004" total