Product Details:

For Securing Z-Series Clamps to Tubing
For Use on Thin Wall Tubing 1/8" Thick and Less
Accepts 5/16"-18 Thread (CAT. NO.ZBOLT)

CRL 5/16"-18 Rivet-Nut is used when attaching Z-Clamps to thin wall tubing. Works in conjunction with part number ZBOLT, Stainless Steel Socket Head Cap Bolt (Undercut Head) which are sold separately. The Grip Range is .027" to .150" (.686 to 3.81 mm). Drilled Hole Size is 17/32" (.53 mm). Made of Zinc Plated Steel.

Grip Range: .027" to .150" (.686 to 3.81 mm)
Drilled Hole Size: 17/32" (.53 mm) 

Additional Information
91134 is strongly recommended with these rivet nuts.