Review on Efficient and Reliable: POWERTEC 71524 Wooden Handscrew Clamp for Superior Woodworking Results by Pop Henneghan

According to the description they have Acme thread. You are not. They have standard threads. Acme threads are designed for heavy-duty applications. The size of these clips doesn't really justify the Acme threads, but I was hoping they were. They are marked as "Made in China". Bought two brackets. The screw holes were a bit torn on one, but this did not affect the function. On the other hand, the holes were cleaner. There is no finish on the wood. The pins are slightly smaller in diameter than the same size "Made in USA" brand, but they were about half the price of the American brand. good value