You don't buy that at a hardware store. I ordered the 8" and yes they are the right length but they are very flimsy and the cable head is very small. In the photo they look like regular zip ties. I will only use them for light use. I recommend not this product.
Heavy Duty 8 Inch Nylon Self-Locking Cable Zip Ties - 100 Pack In Black
52 Review
Organize Your Cords With LuBanSir'S 3 Pack Extension Cord Storage Straps
27 Review
Leather Cable Straps - Organizers For USB, Headphone Wires | Cord Management Solution | 2 Sizes, 5 Colors | Gydandir
26 Review
2-Pack 16In Under Desk Cable Management Tray - Metal Wire Mesh Holder For Desks, Offices & Kitchens (White)
31 Review