Build your own table top hardware kit.  Each "kit" includes a Z-Clip, 1/4-20x15mm threaded insert and a 1/4-20x19mm stainless steel machine screw.  
 
Sold in quantities of 10, 20 or 40, this kit will make fastening table tops a breeze and make finding proper and compatable hardware a non issue.
 
All Z-Clips (in this kit) have the hole pre-drilled to 1/4"