7mm Radius

The underside of the crown is slightly concave to allow for screws that have not been driven flush with the work-surface

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Wheel dresser

Joseph Marples 190mm (7-1/2") Beech Sliding Bevel with Brass Wing Locking Nut 210 Eye Shield Attachment 7mm RadiusA try square which can be adjusted to any angle for marking or checking. The blued steel blade is secured at an angle either by a brass knurled thumbscrew or, more traditionally, by a turn screw (use a screwdriver). The turn screw version is made in accordance with BS3322. Beech Sliding Bevels are only available with wingnut locking system.