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Sometimes referred to as strap duplicators, these handy tools are extremely useful for riveting two layers of sheet metal together. Use these inverted style hole finders when two sheets held too tightly together to get the pilot pin in between them. Simply insert the pilot pin into the existing hole and use the hardened bushing on the opposite strap to guide the drill bit.
Sold in a 5 piece set, including #40, #30, #21, #10, and 1/4 inch.