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Size: Internal Thread Size: M8*1.25; Nut External Diameter: 15.3mm, Length: 25mm 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. M8x25mm, Suggest that the diameter of the hole is 14.3 +/- 0.3mm, the length is about 30mm; 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.