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Size: Internal Thread Size: 1/4"-20; Nut External Diameter: 10.6mm, Length: 15mm How to Use: 1. Pre-drill, drill a well-sized hole first with tools, the following is drilling specification reference, when the material is high-hardness, please enlarge the hole. 1/4"-20x15mm, Suggest that the diameter of the hole is 9.6 +/- 0.2mm, the length is about 18mm; 2. Use the proper internal hex tool to screw in. Warm tips: You can use vise or clip to clamp the both sides while inserting the nuts to wooden board, which can effectively reduce cracking.