Is there a special name for a corner brace which has the countersink on opposite sides? That being that on one leg of the "L" the countersink is on the side pointing out of the angle, where on the other leg it's pointing in? While searching I've only been able to find corner braces with the countersink on the inside of the "L", and I have a feeling it may just not be called a corner brace in other situations (as you probably wouldn't place it in a corner with such a countersink).
Corner brace with countersink on opposite sides
boltshardwarescrews
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If the purpose of the plans is to just protect against damage, I think your plan is probably fine (you might not even have to cut them down to size, I don't see the problem with it overhanging a little bit).
However, it's not clear to me based on that document exactly what the purpose of the splice plates are. To me it sounds like the splice plates are on the outside faces of the braces, nailed through from both sides.
I would call the truss manufacturer to find out specifically what their bracing requirements are.
A standard #10 screw has an outer thread diameter of 3/16". The #10 countersink you are referring to is a combined tool designed for applications where the screw is to pass completely through the material without digging the threads into the wood and have the head sit flush. If you wish to use a screw that is actually going to grip the material, such as a wood screw or self-tapping screw, do not buy the item. Instead you will need an appropriately sized #10 pilot drill (3/32" for soft wood, 7/64" for hardwood) and a separate countersink bit designed for your chosen screw size.
So, the answer depends on the application. If you intend for the screw to pass completely through the first work piece with nothing but the head securing it (no threads biting into the wood) then the combined #10 drill/countersink is great. If you intend for the screw to bite the material, you need a separate pilot drill and countersink bit.
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Best Answer
I'm going to guess, but it might be an 'outside corner bracket'? You could modify a standard corner brackets countersunk openings by using a countersunk bit on the reverse-side of the bracket.