They are very thin and the tip bends rather than penetrating the wood. I've used a lot of glasses and it's just junk from China.
Highly π Sought-After Fastener: Connector 014973445713
9 Review
πͺ Strong and Versatile: National Hardware N222 406 Square Bolts for Secure Fastening
7 Review
π© 5-Pack of M8x60mm Stainless Steel External Hex Expansion Bolts by Yasorn
10 Review
π© M6 1.0 Stainless Steel Flanged Hexagon Flange
8 Review