The T-bolts are long enough (1/2" x #10) and strong as the actual fastener. But do yourself a favor - Drop most zip ties, they are flimsy and flimsy and the end of the insert is so flimsy that you will have to fiddle with it for too long, use a decent quality zip tie and you're done were NOT included.
2-Pack 16In Under Desk Cable Management Tray - Metal Wire Mesh Holder For Desks, Offices & Kitchens (White)
31 Review
Heavy Duty 8 Inch Nylon Self-Locking Cable Zip Ties - 100 Pack In Black
52 Review
25 Pieces Desk Wire Organizer Cable Ties Zip Ties Adhesive Cord Clips Cable Management Cord Keeper Desk Wire Management
25 Review
Organize Your Cords With LuBanSir'S 3 Pack Extension Cord Storage Straps
27 Review