Sharpen those shears, ’cause this Harbor Freight coupon expires today. You can check out their other coupons, too, but this knockout punch kit makes the top of my list. It allows you to cut perfect holes in 10-gauge mild steel, aluminum, and fiberglass. The kit includes dies sized 1/2″, 3/4″, 1″, and 1-1/4″, and hole punches sized 7/8″, 1-3/32″, 1-11/32″, and 1-11/16″, all made from heat-treated, high-carbon steel. You’ll also get driving screws and a mold-blown plastic case to hold it all. After today, the price reverts back to $15.