![]() WARNING: Cancer and Reproductive Harm - .gov. They were designed to eliminate double drilled holes and drill bits "skating" off of rivets. I hadnt seen oversized Whitney punches before - Ill definitely look for those as Ive just finished restoring a Diacro punch. They are compact, easy to grip and easy to spot if dropped. Using a 1/8' bit, the 1/8 pop rivet will spread the sheets apart slighly and not pull them snug. The guides allow you to drill straight and center every time. ![]() For convenience I typically use ΒΌ - 20 or 5/16 - 18 as the bolts are commonly available everywhere. Use either metric or SAE sizes or mix and match. It has to be an exact fit or you may have problems with it spinning. After the head is drilled, the rivet can be punched out with little effort. The hole you need to drill is based on the outer diameter of the rivnut. Usually there is no need to drill much past the thickness of the rivet head in depth. Dip drill bit in lube, insert drill into bore of guide and drill. Hold firmly with two fingers, making sure there is no movement from side to side. There is a significant number of different types of drill bits available. Use Letter "D" (.246) drill bit and guide for 1/4 inch diameter rivets. 60-Degree High Speed Steel Countersink Bit with 6 Flutes. Use #13 drill bit and guide for 3/16 inch diameter rivets. Use #21 drill bit and guide for 5/32 inch diameter rivets. Use #31 drill bit and guide for 1/8 inch diameter rivets. Use #41 drill bit and guide for 3/32 inch diameter rivets. First select the appropriate guide for the rivet being drilled. Dip drill bit in lubricant at least once for every rivet. The drill lube is to ensure smooth minimal friction between the drill bit and the guide, cooling the bit, keeping it from galling, which aids in longer drill and guide life. This set is designed one size under bore and hardened C1144 steel for long life.
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