edge of a cut

end cutting edge angle

dulling of cutting edges

dulling of cutting edges

point of the cutting edge | reference point of the cutting edge

minor cutting edge | secondary cutting edge | front cutting edge

(4) Every metal part of a product shall be free from burrs, sharp edges, corners or points and any cut end of metal tubing that is accessible to the occupant shall be protected by a cap that will remain in place when subjected to a load of 90N (20.23 lb) applied in any direction.

(2) When a double bottom is required by this section to be fitted in a ship, the inner bottom shall be continued out to the ship’s sides in such a manner as to protect the bottom to the turn of the bilge; the inner bottom shall be deemed to be adequate for this purpose if the line of intersection of the outer edge of the margin plate with the bilge plating is not lower at any point than a horizontal plane passing through the point of intersection with the frame line amidships of a transverse diagonal line inclined at 25 degrees to the base line and cutting it at a point one half of the ship’s moulded breadth from the middle line.

I put in the parameters of what I'd need with those sizes—the bridge size, the width size—and suddenly those were all the frames that came that would fit on my face and be useful to me.