Self Locking Washers Round (500)

I used the self locking washers to lock the adhesive insulation pins on my garage door. They did the job but it left about 2 inches of sharp pin sticking out. I can see where this might be dangerous if you bumped into any of the pins. Children beware. I suggest using the domed caps although you still have 2 inches of pin albeit capped. For my use it worked just fine as I clipped the pins short to about 3/4 inch.

Some of the washers didn't lock on the stick pins, but even worse many of the stick pins didn't hold to the metal panels.

Used these with sheet metal screws to secure insulation to ductwork. I faced the bevel into the insulation to help grab it.

Must have if you are using the spikes for insulation pins. I don't know why they don't sell them together.

They worked out great

Locking washers work great, once they are on they don't come off easily

Excellent

Worked as advertise. Great product. Use to secure insulation to ceiling of storage containers